36720961 has 4 divisors (see below), whose sum is σ = 36763524. Its totient is φ = 36678400.

The previous prime is 36720947. The next prime is 36720973. The reversal of 36720961 is 16902763.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16902763 = 1063 ⋅15901.

It can be written as a sum of positive squares in 2 ways, for example, as 18870336 + 17850625 = 4344^2 + 4225^2 .

It is a cyclic number.

It is not a de Polignac number, because 36720961 - 2⁹ = 36720449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36720161) 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, 19960 + ... + 21721.

It is an arithmetic number, because the mean of its divisors is an integer number (9190881).

Almost surely, 2^36720961 is an apocalyptic number.

It is an amenable number.

36720961 is a deficient number, since it is larger than the sum of its proper divisors (42563).

36720961 is an equidigital number, since it uses as much as digits as its factorization.

36720961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42562.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 36720961 is about 6059.7822568142. The cubic root of 36720961 is about 332.3823949506.

The spelling of 36720961 in words is "thirty-six million, seven hundred twenty thousand, nine hundred sixty-one".