161010251 has 4 divisors (see below), whose sum is σ = 162035952. Its totient is φ = 159984552.

The previous prime is 161010229. The next prime is 161010253. The reversal of 161010251 is 152010161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161010251 - 2²² = 156815947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161010253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512615 + ... + 512928.

It is an arithmetic number, because the mean of its divisors is an integer number (40508988).

Almost surely, 2^161010251 is an apocalyptic number.

161010251 is a deficient number, since it is larger than the sum of its proper divisors (1025701).

161010251 is a wasteful number, since it uses less digits than its factorization.

161010251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025700.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 161010251 is about 12688.9814800086. The cubic root of 161010251 is about 544.0237281948.

The spelling of 161010251 in words is "one hundred sixty-one million, ten thousand, two hundred fifty-one".