161281157 has 2 divisors, whose sum is σ = 161281158. Its totient is φ = 161281156.

The previous prime is 161281147. The next prime is 161281199. The reversal of 161281157 is 751182161.

161281157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151757761 + 9523396 = 12319^2 + 3086^2 .

It is a cyclic number.

It is not a de Polignac number, because 161281157 - 2¹⁴ = 161264773 is a prime.

It is a super-2 number, since 2×161281157² = 52023223206517298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161281117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80640578 + 80640579.

It is an arithmetic number, because the mean of its divisors is an integer number (80640579).

Almost surely, 2^161281157 is an apocalyptic number.

It is an amenable number.

161281157 is a deficient number, since it is larger than the sum of its proper divisors (1).

161281157 is an equidigital number, since it uses as much as digits as its factorization.

161281157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 32.

The square root of 161281157 is about 12699.6518456216. The cubic root of 161281157 is about 544.3286709158.

The spelling of 161281157 in words is "one hundred sixty-one million, two hundred eighty-one thousand, one hundred fifty-seven".