161264431 has 16 divisors (see below), whose sum is σ = 179181504. Its totient is φ = 144359424.

The previous prime is 161264429. The next prime is 161264443. The reversal of 161264431 is 134462161.

It is a cyclic number.

It is not a de Polignac number, because 161264431 - 2¹ = 161264429 is a prime.

It is a super-2 number, since 2×161264431² = 52012433411507522, 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 161264431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161264401) 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, 74395 + ... + 76531.

It is an arithmetic number, because the mean of its divisors is an integer number (11198844).

Almost surely, 2^161264431 is an apocalyptic number.

161264431 is a deficient number, since it is larger than the sum of its proper divisors (17917073).

161264431 is a wasteful number, since it uses less digits than its factorization.

161264431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370.

The product of its digits is 3456, while the sum is 28.

The square root of 161264431 is about 12698.9933065578. The cubic root of 161264431 is about 544.3098533505.

The spelling of 161264431 in words is "one hundred sixty-one million, two hundred sixty-four thousand, four hundred thirty-one".