97748131561 has 2 divisors, whose sum is σ = 97748131562. Its totient is φ = 97748131560.

The previous prime is 97748131553. The next prime is 97748131567. The reversal of 97748131561 is 16513184779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76593883536 + 21154248025 = 276756^2 + 145445^2 .

It is a cyclic number.

It is not a de Polignac number, because 97748131561 - 2³ = 97748131553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 97748131499 and 97748131508.

It is not a weakly prime, because it can be changed into another prime (97748131567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48874065780 + 48874065781.

It is an arithmetic number, because the mean of its divisors is an integer number (48874065781).

Almost surely, 2^97748131561 is an apocalyptic number.

It is an amenable number.

97748131561 is a deficient number, since it is larger than the sum of its proper divisors (1).

97748131561 is an equidigital number, since it uses as much as digits as its factorization.

97748131561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 52.

The spelling of 97748131561 in words is "ninety-seven billion, seven hundred forty-eight million, one hundred thirty-one thousand, five hundred sixty-one".