161210651 has 16 divisors (see below), whose sum is σ = 187294464. Its totient is φ = 135906144.

The previous prime is 161210641. The next prime is 161210653. The reversal of 161210651 is 156012161.

It is a cyclic number.

It is not a de Polignac number, because 161210651 - 2¹⁰ = 161209627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161210653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169760 + ... + 170706.

It is an arithmetic number, because the mean of its divisors is an integer number (11705904).

Almost surely, 2^161210651 is an apocalyptic number.

161210651 is a deficient number, since it is larger than the sum of its proper divisors (26083813).

161210651 is an equidigital number, since it uses as much as digits as its factorization.

161210651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 161210651 is about 12696.8756393059. The cubic root of 161210651 is about 544.2493394099.

The spelling of 161210651 in words is "one hundred sixty-one million, two hundred ten thousand, six hundred fifty-one".