97129889 has 2 divisors, whose sum is σ = 97129890. Its totient is φ = 97129888.

The previous prime is 97129829. The next prime is 97129933. The reversal of 97129889 is 98892179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96334225 + 795664 = 9815^2 + 892^2 .

It is a cyclic number.

It is not a de Polignac number, because 97129889 - 2²⁴ = 80352673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97129889.

It is not a weakly prime, because it can be changed into another prime (97129829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48564944 + 48564945.

It is an arithmetic number, because the mean of its divisors is an integer number (48564945).

Almost surely, 2^97129889 is an apocalyptic number.

It is an amenable number.

97129889 is a deficient number, since it is larger than the sum of its proper divisors (1).

97129889 is an equidigital number, since it uses as much as digits as its factorization.

97129889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 53.

The square root of 97129889 is about 9855.4497106931. The cubic root of 97129889 is about 459.6750840378.

The spelling of 97129889 in words is "ninety-seven million, one hundred twenty-nine thousand, eight hundred eighty-nine".