81883877 has 2 divisors, whose sum is σ = 81883878. Its totient is φ = 81883876.

The previous prime is 81883871. The next prime is 81883897. The reversal of 81883877 is 77838818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59737441 + 22146436 = 7729^2 + 4706^2 .

It is a cyclic number.

It is not a de Polignac number, because 81883877 - 2⁴ = 81883861 is a prime.

It is a super-2 number, since 2×81883877² = 13409938625102258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81883871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40941938 + 40941939.

It is an arithmetic number, because the mean of its divisors is an integer number (40941939).

Almost surely, 2^81883877 is an apocalyptic number.

It is an amenable number.

81883877 is a deficient number, since it is larger than the sum of its proper divisors (1).

81883877 is an equidigital number, since it uses as much as digits as its factorization.

81883877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 602112, while the sum is 50.

The square root of 81883877 is about 9048.9710464782. The cubic root of 81883877 is about 434.2429727415.

The spelling of 81883877 in words is "eighty-one million, eight hundred eighty-three thousand, eight hundred seventy-seven".