161232251 has 2 divisors, whose sum is σ = 161232252. Its totient is φ = 161232250.

The previous prime is 161232229. The next prime is 161232283. The reversal of 161232251 is 152232161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161232251 - 2¹⁸ = 160970107 is a prime.

It is not a weakly prime, because it can be changed into another prime (161232451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80616125 + 80616126.

It is an arithmetic number, because the mean of its divisors is an integer number (80616126).

Almost surely, 2^161232251 is an apocalyptic number.

161232251 is a deficient number, since it is larger than the sum of its proper divisors (1).

161232251 is an equidigital number, since it uses as much as digits as its factorization.

161232251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 161232251 is about 12697.7262137754. The cubic root of 161232251 is about 544.2736456218.

The spelling of 161232251 in words is "one hundred sixty-one million, two hundred thirty-two thousand, two hundred fifty-one".