97740989 has 2 divisors, whose sum is σ = 97740990. Its totient is φ = 97740988.

The previous prime is 97740931. The next prime is 97741001. The reversal of 97740989 is 98904779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92256025 + 5484964 = 9605^2 + 2342^2 .

It is a cyclic number.

It is not a de Polignac number, because 97740989 - 2⁸ = 97740733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97740989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97740919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48870494 + 48870495.

It is an arithmetic number, because the mean of its divisors is an integer number (48870495).

Almost surely, 2^97740989 is an apocalyptic number.

It is an amenable number.

97740989 is a deficient number, since it is larger than the sum of its proper divisors (1).

97740989 is an equidigital number, since it uses as much as digits as its factorization.

97740989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 97740989 is about 9886.4042502823. The cubic root of 97740989 is about 460.6370961109.

The spelling of 97740989 in words is "ninety-seven million, seven hundred forty thousand, nine hundred eighty-nine".