165426431 has 4 divisors (see below), whose sum is σ = 169461264. Its totient is φ = 161391600.

The previous prime is 165426403. The next prime is 165426451. The reversal of 165426431 is 134624561.

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

It is a cyclic number.

It is not a de Polignac number, because 165426431 - 2⁶ = 165426367 is a prime.

It is a super-2 number, since 2×165426431² = 54731808146795522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165426451) 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, 2017355 + ... + 2017436.

It is an arithmetic number, because the mean of its divisors is an integer number (42365316).

Almost surely, 2^165426431 is an apocalyptic number.

165426431 is a deficient number, since it is larger than the sum of its proper divisors (4034833).

165426431 is an equidigital number, since it uses as much as digits as its factorization.

165426431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4034832.

The product of its digits is 17280, while the sum is 32.

The square root of 165426431 is about 12861.8206720511. The cubic root of 165426431 is about 548.9527521181.

The spelling of 165426431 in words is "one hundred sixty-five million, four hundred twenty-six thousand, four hundred thirty-one".