820076731 has 2 divisors, whose sum is σ = 820076732. Its totient is φ = 820076730.

The previous prime is 820076723. The next prime is 820076749. The reversal of 820076731 is 137670028.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820076731 - 2³ = 820076723 is a prime.

It is a super-2 number, since 2×820076731² = 1345051689455292722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (820076701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410038365 + 410038366.

It is an arithmetic number, because the mean of its divisors is an integer number (410038366).

Almost surely, 2^820076731 is an apocalyptic number.

820076731 is a deficient number, since it is larger than the sum of its proper divisors (1).

820076731 is an equidigital number, since it uses as much as digits as its factorization.

820076731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 820076731 is about 28636.9818765875. The cubic root of 820076731 is about 936.0193563064.

The spelling of 820076731 in words is "eight hundred twenty million, seventy-six thousand, seven hundred thirty-one".