161228857 has 2 divisors, whose sum is σ = 161228858. Its totient is φ = 161228856.

The previous prime is 161228839. The next prime is 161228909. The reversal of 161228857 is 758822161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92852496 + 68376361 = 9636^2 + 8269^2 .

It is a cyclic number.

It is not a de Polignac number, because 161228857 - 2⁷ = 161228729 is a prime.

It is not a weakly prime, because it can be changed into another prime (161228057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80614428 + 80614429.

It is an arithmetic number, because the mean of its divisors is an integer number (80614429).

Almost surely, 2^161228857 is an apocalyptic number.

It is an amenable number.

161228857 is a deficient number, since it is larger than the sum of its proper divisors (1).

161228857 is an equidigital number, since it uses as much as digits as its factorization.

161228857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 40.

The square root of 161228857 is about 12697.5925670971. The cubic root of 161228857 is about 544.2698265395.

The spelling of 161228857 in words is "one hundred sixty-one million, two hundred twenty-eight thousand, eight hundred fifty-seven".