33531961 has 4 divisors (see below), whose sum is σ = 33702372. Its totient is φ = 33361552.

The previous prime is 33531947. The next prime is 33531977. The reversal of 33531961 is 16913533.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20070400 + 13461561 = 4480^2 + 3669^2 .

It is a cyclic number.

It is not a de Polignac number, because 33531961 - 2⁵ = 33531929 is a prime.

It is a super-2 number, since 2×33531961² = 2248784817011042, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33531931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84910 + ... + 85303.

It is an arithmetic number, because the mean of its divisors is an integer number (8425593).

Almost surely, 2^33531961 is an apocalyptic number.

It is an amenable number.

33531961 is a deficient number, since it is larger than the sum of its proper divisors (170411).

33531961 is a wasteful number, since it uses less digits than its factorization.

33531961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170410.

The product of its digits is 7290, while the sum is 31.

The square root of 33531961 is about 5790.6788030420. The cubic root of 33531961 is about 322.4677723540.

The spelling of 33531961 in words is "thirty-three million, five hundred thirty-one thousand, nine hundred sixty-one".