81762797 has 2 divisors, whose sum is σ = 81762798. Its totient is φ = 81762796.

The previous prime is 81762767. The next prime is 81762817. The reversal of 81762797 is 79726718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41744521 + 40018276 = 6461^2 + 6326^2 .

It is a cyclic number.

It is not a de Polignac number, because 81762797 - 2²² = 77568493 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 (81762767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40881398 + 40881399.

It is an arithmetic number, because the mean of its divisors is an integer number (40881399).

Almost surely, 2^81762797 is an apocalyptic number.

It is an amenable number.

81762797 is a deficient number, since it is larger than the sum of its proper divisors (1).

81762797 is an equidigital number, since it uses as much as digits as its factorization.

81762797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 47.

The square root of 81762797 is about 9042.2783080372. The cubic root of 81762797 is about 434.0288317825.

The spelling of 81762797 in words is "eighty-one million, seven hundred sixty-two thousand, seven hundred ninety-seven".