164531641 has 4 divisors (see below), whose sum is σ = 166614400. Its totient is φ = 162448884.

The previous prime is 164531639. The next prime is 164531669. The reversal of 164531641 is 146135461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 146135461 = 541 ⋅270121.

It is a cyclic number.

It is not a de Polignac number, because 164531641 - 2¹ = 164531639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164531041) 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, 1041261 + ... + 1041418.

It is an arithmetic number, because the mean of its divisors is an integer number (41653600).

Almost surely, 2^164531641 is an apocalyptic number.

164531641 is the 8113-rd centered pentagonal number.

It is an amenable number.

164531641 is a deficient number, since it is larger than the sum of its proper divisors (2082759).

164531641 is an equidigital number, since it uses as much as digits as its factorization.

164531641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082758.

The product of its digits is 8640, while the sum is 31.

The square root of 164531641 is about 12826.9887736756. The cubic root of 164531641 is about 547.9612021212.

The spelling of 164531641 in words is "one hundred sixty-four million, five hundred thirty-one thousand, six hundred forty-one".