161502641 has 4 divisors (see below), whose sum is σ = 170002800. Its totient is φ = 153002484.

The previous prime is 161502637. The next prime is 161502673. The reversal of 161502641 is 146205161.

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: 146205161 = 1877 ⋅77893.

It is a cyclic number.

It is not a de Polignac number, because 161502641 - 2² = 161502637 is a prime.

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 161502641.

It is not an unprimeable number, because it can be changed into a prime (161502041) 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, 4250051 + ... + 4250088.

It is an arithmetic number, because the mean of its divisors is an integer number (42500700).

Almost surely, 2^161502641 is an apocalyptic number.

It is an amenable number.

161502641 is a deficient number, since it is larger than the sum of its proper divisors (8500159).

161502641 is an equidigital number, since it uses as much as digits as its factorization.

161502641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8500158.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 161502641 is about 12708.3689354693. The cubic root of 161502641 is about 544.5777286237.

The spelling of 161502641 in words is "one hundred sixty-one million, five hundred two thousand, six hundred forty-one".