161627251 has 2 divisors, whose sum is σ = 161627252. Its totient is φ = 161627250.

The previous prime is 161627201. The next prime is 161627267. The reversal of 161627251 is 152726161.

161627251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161627251 - 2⁹ = 161626739 is a prime.

It is a super-2 number, since 2×161627251² = 52246736531634002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161627201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80813625 + 80813626.

It is an arithmetic number, because the mean of its divisors is an integer number (80813626).

Almost surely, 2^161627251 is an apocalyptic number.

161627251 is a deficient number, since it is larger than the sum of its proper divisors (1).

161627251 is an equidigital number, since it uses as much as digits as its factorization.

161627251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 161627251 is about 12713.2706649391. The cubic root of 161627251 is about 544.7177518973.

The spelling of 161627251 in words is "one hundred sixty-one million, six hundred twenty-seven thousand, two hundred fifty-one".