97151940581 has 2 divisors, whose sum is σ = 97151940582. Its totient is φ = 97151940580.

The previous prime is 97151940553. The next prime is 97151940643. The reversal of 97151940581 is 18504915179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95981616481 + 1170324100 = 309809^2 + 34210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97151940581 is a prime.

It is a super-2 number, since 2×97151940581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97151940511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48575970290 + 48575970291.

It is an arithmetic number, because the mean of its divisors is an integer number (48575970291).

Almost surely, 2^97151940581 is an apocalyptic number.

It is an amenable number.

97151940581 is a deficient number, since it is larger than the sum of its proper divisors (1).

97151940581 is an equidigital number, since it uses as much as digits as its factorization.

97151940581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 453600, while the sum is 50.

The spelling of 97151940581 in words is "ninety-seven billion, one hundred fifty-one million, nine hundred forty thousand, five hundred eighty-one".