846157681 has 2 divisors, whose sum is σ = 846157682. Its totient is φ = 846157680.

The previous prime is 846157633. The next prime is 846157691. The reversal of 846157681 is 186751648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 795747681 + 50410000 = 28209^2 + 7100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-846157681 is a prime.

It is a super-2 number, since 2×846157681² = 1431965642230595522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (846157601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423078840 + 423078841.

It is an arithmetic number, because the mean of its divisors is an integer number (423078841).

Almost surely, 2^846157681 is an apocalyptic number.

It is an amenable number.

846157681 is a deficient number, since it is larger than the sum of its proper divisors (1).

846157681 is an equidigital number, since it uses as much as digits as its factorization.

846157681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 46.

The square root of 846157681 is about 29088.7896104324. The cubic root of 846157681 is about 945.8387450916.

The spelling of 846157681 in words is "eight hundred forty-six million, one hundred fifty-seven thousand, six hundred eighty-one".