161637007 has 16 divisors (see below), whose sum is σ = 193828864. Its totient is φ = 131868000.

The previous prime is 161636999. The next prime is 161637011. The reversal of 161637007 is 700736161.

It is a cyclic number.

It is not a de Polignac number, because 161637007 - 2³ = 161636999 is a prime.

It is a super-2 number, since 2×161637007² = 52253044063836098, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 161637007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161637907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7132 + ... + 19342.

It is an arithmetic number, because the mean of its divisors is an integer number (12114304).

Almost surely, 2^161637007 is an apocalyptic number.

161637007 is a deficient number, since it is larger than the sum of its proper divisors (32191857).

161637007 is a wasteful number, since it uses less digits than its factorization.

161637007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12310.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 161637007 is about 12713.6543527028. The cubic root of 161637007 is about 544.7287115992.

The spelling of 161637007 in words is "one hundred sixty-one million, six hundred thirty-seven thousand, seven".