97509989 has 2 divisors, whose sum is σ = 97509990. Its totient is φ = 97509988.

The previous prime is 97509959. The next prime is 97510001. The reversal of 97509989 is 98990579.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68973025 + 28536964 = 8305^2 + 5342^2 .

It is an emirp because it is prime and its reverse (98990579) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97509989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97509959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48754994 + 48754995.

It is an arithmetic number, because the mean of its divisors is an integer number (48754995).

Almost surely, 2^97509989 is an apocalyptic number.

It is an amenable number.

97509989 is a deficient number, since it is larger than the sum of its proper divisors (1).

97509989 is an equidigital number, since it uses as much as digits as its factorization.

97509989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1837080, while the sum is 56.

The square root of 97509989 is about 9874.7146287880. The cubic root of 97509989 is about 460.2739216034.

The spelling of 97509989 in words is "ninety-seven million, five hundred nine thousand, nine hundred eighty-nine".