161007251 has 2 divisors, whose sum is σ = 161007252. Its totient is φ = 161007250.

The previous prime is 161007229. The next prime is 161007257. The reversal of 161007251 is 152700161.

It is a strong prime.

It is an emirp because it is prime and its reverse (152700161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161007251 - 2¹⁰ = 161006227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (161007257) 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 as a sum of consecutive naturals, namely, 80503625 + 80503626.

It is an arithmetic number, because the mean of its divisors is an integer number (80503626).

Almost surely, 2^161007251 is an apocalyptic number.

161007251 is a deficient number, since it is larger than the sum of its proper divisors (1).

161007251 is an equidigital number, since it uses as much as digits as its factorization.

161007251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 161007251 is about 12688.8632666603. The cubic root of 161007251 is about 544.0203493595.

The spelling of 161007251 in words is "one hundred sixty-one million, seven thousand, two hundred fifty-one".