81574877 has 2 divisors, whose sum is σ = 81574878. Its totient is φ = 81574876.

The previous prime is 81574861. The next prime is 81574903. The reversal of 81574877 is 77847518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40883236 + 40691641 = 6394^2 + 6379^2 .

It is a cyclic number.

It is not a de Polignac number, because 81574877 - 2⁴ = 81574861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81574777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40787438 + 40787439.

It is an arithmetic number, because the mean of its divisors is an integer number (40787439).

Almost surely, 2^81574877 is an apocalyptic number.

It is an amenable number.

81574877 is a deficient number, since it is larger than the sum of its proper divisors (1).

81574877 is an equidigital number, since it uses as much as digits as its factorization.

81574877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 439040, while the sum is 47.

The square root of 81574877 is about 9031.8811440364. The cubic root of 81574877 is about 433.6960591456.

The spelling of 81574877 in words is "eighty-one million, five hundred seventy-four thousand, eight hundred seventy-seven".