33780961 has 4 divisors (see below), whose sum is σ = 33840900. Its totient is φ = 33721024.

The previous prime is 33780949. The next prime is 33780973. The reversal of 33780961 is 16908733.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16908733 = 31 ⋅545443.

It is an interprime number because it is at equal distance from previous prime (33780949) and next prime (33780973).

It can be written as a sum of positive squares in 2 ways, for example, as 3045025 + 30735936 = 1745^2 + 5544^2 .

It is a cyclic number.

It is not a de Polignac number, because 33780961 - 2¹³ = 33772769 is a prime.

It is a super-2 number, since 2×33780961² = 2282306652167042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33780961.

It is not an unprimeable number, because it can be changed into a prime (33780941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29116 + ... + 30253.

It is an arithmetic number, because the mean of its divisors is an integer number (8460225).

Almost surely, 2^33780961 is an apocalyptic number.

It is an amenable number.

33780961 is a deficient number, since it is larger than the sum of its proper divisors (59939).

33780961 is an equidigital number, since it uses as much as digits as its factorization.

33780961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59938.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 33780961 is about 5812.1391070758. The cubic root of 33780961 is about 323.2639932318.

The spelling of 33780961 in words is "thirty-three million, seven hundred eighty thousand, nine hundred sixty-one".