81495677 has 2 divisors, whose sum is σ = 81495678. Its totient is φ = 81495676.

The previous prime is 81495649. The next prime is 81495721. The reversal of 81495677 is 77659418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56235001 + 25260676 = 7499^2 + 5026^2 .

It is a cyclic number.

It is not a de Polignac number, because 81495677 - 2⁶ = 81495613 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 (81495377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40747838 + 40747839.

It is an arithmetic number, because the mean of its divisors is an integer number (40747839).

Almost surely, 2^81495677 is an apocalyptic number.

It is an amenable number.

81495677 is a deficient number, since it is larger than the sum of its proper divisors (1).

81495677 is an equidigital number, since it uses as much as digits as its factorization.

81495677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 47.

The square root of 81495677 is about 9027.4956106331. The cubic root of 81495677 is about 433.5556570537. Note that the first 3 decimals are identical.

The spelling of 81495677 in words is "eighty-one million, four hundred ninety-five thousand, six hundred seventy-seven".