81497346131 has 2 divisors, whose sum is σ = 81497346132. Its totient is φ = 81497346130.

The previous prime is 81497346121. The next prime is 81497346137. The reversal of 81497346131 is 13164379418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81497346131 - 2¹⁴ = 81497329747 is a prime.

It is a super-2 number, since 2×81497346131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81497346137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40748673065 + 40748673066.

It is an arithmetic number, because the mean of its divisors is an integer number (40748673066).

Almost surely, 2^81497346131 is an apocalyptic number.

81497346131 is a deficient number, since it is larger than the sum of its proper divisors (1).

81497346131 is an equidigital number, since it uses as much as digits as its factorization.

81497346131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The spelling of 81497346131 in words is "eighty-one billion, four hundred ninety-seven million, three hundred forty-six thousand, one hundred thirty-one".