77031881 has 2 divisors, whose sum is σ = 77031882. Its totient is φ = 77031880.

The previous prime is 77031847. The next prime is 77031937. The reversal of 77031881 is 18813077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44769481 + 32262400 = 6691^2 + 5680^2 .

It is an emirp because it is prime and its reverse (18813077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77031881 - 2²² = 72837577 is a prime.

It is a super-2 number, since 2×77031881² = 11867821380796322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77031841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38515940 + 38515941.

It is an arithmetic number, because the mean of its divisors is an integer number (38515941).

Almost surely, 2^77031881 is an apocalyptic number.

It is an amenable number.

77031881 is a deficient number, since it is larger than the sum of its proper divisors (1).

77031881 is an equidigital number, since it uses as much as digits as its factorization.

77031881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 77031881 is about 8776.7807879655. The cubic root of 77031881 is about 425.4907935629.

The spelling of 77031881 in words is "seventy-seven million, thirty-one thousand, eight hundred eighty-one".