165562431 has 4 divisors (see below), whose sum is σ = 220749912. Its totient is φ = 110374952.

The previous prime is 165562379. The next prime is 165562489. The reversal of 165562431 is 134265561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134265561 = 3 ⋅44755187.

It is a cyclic number.

It is not a de Polignac number, because 165562431 - 2⁶ = 165562367 is a prime.

It is a super-2 number, since 2×165562431² = 54821837117259522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165562392 and 165562401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165562931) 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, 27593736 + ... + 27593741.

It is an arithmetic number, because the mean of its divisors is an integer number (55187478).

Almost surely, 2^165562431 is an apocalyptic number.

165562431 is a deficient number, since it is larger than the sum of its proper divisors (55187481).

165562431 is an equidigital number, since it uses as much as digits as its factorization.

165562431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55187480.

The product of its digits is 21600, while the sum is 33.

The square root of 165562431 is about 12867.1065512026. The cubic root of 165562431 is about 549.1031455066.

The spelling of 165562431 in words is "one hundred sixty-five million, five hundred sixty-two thousand, four hundred thirty-one".