161675251 has 4 divisors (see below), whose sum is σ = 161767512. Its totient is φ = 161582992.

The previous prime is 161675243. The next prime is 161675273. The reversal of 161675251 is 152576161.

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 161675251 - 2³ = 161675243 is a prime.

It is a super-2 number, since 2×161675251² = 52277773571826002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161675651) 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, 43450 + ... + 47023.

It is an arithmetic number, because the mean of its divisors is an integer number (40441878).

Almost surely, 2^161675251 is an apocalyptic number.

161675251 is a deficient number, since it is larger than the sum of its proper divisors (92261).

161675251 is an equidigital number, since it uses as much as digits as its factorization.

161675251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92260.

The product of its digits is 12600, while the sum is 34.

The square root of 161675251 is about 12715.1583159629. The cubic root of 161675251 is about 544.7716699176.

It can be divided in two parts, 1616 and 75251, that added together give a palindrome (76867).

The spelling of 161675251 in words is "one hundred sixty-one million, six hundred seventy-five thousand, two hundred fifty-one".