8261931497 has 2 divisors, whose sum is σ = 8261931498. Its totient is φ = 8261931496.

The previous prime is 8261931479. The next prime is 8261931563. The reversal of 8261931497 is 7941391628.

Together with previous prime (8261931479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5347119376 + 2914812121 = 73124^2 + 53989^2 .

It is a cyclic number.

It is not a de Polignac number, because 8261931497 - 2²⁰ = 8260882921 is a prime.

It is a super-2 number, since 2×8261931497² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8261931467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4130965748 + 4130965749.

It is an arithmetic number, because the mean of its divisors is an integer number (4130965749).

Almost surely, 2^8261931497 is an apocalyptic number.

It is an amenable number.

8261931497 is a deficient number, since it is larger than the sum of its proper divisors (1).

8261931497 is an equidigital number, since it uses as much as digits as its factorization.

8261931497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 8261931497 is about 90895.1676218268. The cubic root of 8261931497 is about 2021.5936429748.

The spelling of 8261931497 in words is "eight billion, two hundred sixty-one million, nine hundred thirty-one thousand, four hundred ninety-seven".