165501431 has 8 divisors (see below), whose sum is σ = 169257600. Its totient is φ = 161777080.

The previous prime is 165501389. The next prime is 165501499. The reversal of 165501431 is 134105561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165501431 - 2¹⁰ = 165500407 is a prime.

It is a super-2 number, since 2×165501431² = 54781447326095522, 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 165501431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165501631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2726 + ... + 18396.

It is an arithmetic number, because the mean of its divisors is an integer number (21157200).

Almost surely, 2^165501431 is an apocalyptic number.

165501431 is a deficient number, since it is larger than the sum of its proper divisors (3756169).

165501431 is a wasteful number, since it uses less digits than its factorization.

165501431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15909.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 165501431 is about 12864.7359475428. The cubic root of 165501431 is about 549.0356998383.

Adding to 165501431 its reverse (134105561), we get a palindrome (299606992).

The spelling of 165501431 in words is "one hundred sixty-five million, five hundred one thousand, four hundred thirty-one".