165146531 has 16 divisors (see below), whose sum is σ = 186468480. Its totient is φ = 144957120.

The previous prime is 165146521. The next prime is 165146533. The reversal of 165146531 is 135641561.

It is a de Polignac number, because none of the positive numbers 2^k-165146531 is a prime.

It is a super-2 number, since 2×165146531² = 54546753402667922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165146533) 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 15 ways as a sum of consecutive naturals, for example, 40136 + ... + 44058.

It is an arithmetic number, because the mean of its divisors is an integer number (11654280).

Almost surely, 2^165146531 is an apocalyptic number.

165146531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165146531 is a deficient number, since it is larger than the sum of its proper divisors (21321949).

165146531 is a wasteful number, since it uses less digits than its factorization.

165146531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066.

The product of its digits is 10800, while the sum is 32.

The square root of 165146531 is about 12850.9350243475. The cubic root of 165146531 is about 548.6429696665.

The spelling of 165146531 in words is "one hundred sixty-five million, one hundred forty-six thousand, five hundred thirty-one".