81376877 has 2 divisors, whose sum is σ = 81376878. Its totient is φ = 81376876.

The previous prime is 81376861. The next prime is 81376931. The reversal of 81376877 is 77867318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66275881 + 15100996 = 8141^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 81376877 - 2⁴ = 81376861 is a prime.

It is a super-2 number, since 2×81376877² = 13244392220546258, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81379877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40688438 + 40688439.

It is an arithmetic number, because the mean of its divisors is an integer number (40688439).

Almost surely, 2^81376877 is an apocalyptic number.

It is an amenable number.

81376877 is a deficient number, since it is larger than the sum of its proper divisors (1).

81376877 is an equidigital number, since it uses as much as digits as its factorization.

81376877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 47.

The square root of 81376877 is about 9020.9133129634. The cubic root of 81376877 is about 433.3448832556.

The spelling of 81376877 in words is "eighty-one million, three hundred seventy-six thousand, eight hundred seventy-seven".