165654431 has 4 divisors (see below), whose sum is σ = 167987664. Its totient is φ = 163321200.

The previous prime is 165654403. The next prime is 165654449. The reversal of 165654431 is 134456561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134456561 = 5113 ⋅26297.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165654431 is a prime.

It is a super-2 number, since 2×165654431² = 54882781019867522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165654391 and 165654400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165654031) 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, 1166510 + ... + 1166651.

It is an arithmetic number, because the mean of its divisors is an integer number (41996916).

Almost surely, 2^165654431 is an apocalyptic number.

165654431 is a deficient number, since it is larger than the sum of its proper divisors (2333233).

165654431 is an equidigital number, since it uses as much as digits as its factorization.

165654431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333232.

The product of its digits is 43200, while the sum is 35.

The square root of 165654431 is about 12870.6810620107. The cubic root of 165654431 is about 549.2048355151.

The spelling of 165654431 in words is "one hundred sixty-five million, six hundred fifty-four thousand, four hundred thirty-one".