97489991 has 2 divisors, whose sum is σ = 97489992. Its totient is φ = 97489990.

The previous prime is 97489963. The next prime is 97490021. The reversal of 97489991 is 19998479.

It is a weak prime.

It is an emirp because it is prime and its reverse (19998479) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97489991 - 2¹⁰ = 97488967 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 (97489921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48744995 + 48744996.

It is an arithmetic number, because the mean of its divisors is an integer number (48744996).

Almost surely, 2^97489991 is an apocalyptic number.

97489991 is a deficient number, since it is larger than the sum of its proper divisors (1).

97489991 is an equidigital number, since it uses as much as digits as its factorization.

97489991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 56.

The square root of 97489991 is about 9873.7019906416. The cubic root of 97489991 is about 460.2424541018.

The spelling of 97489991 in words is "ninety-seven million, four hundred eighty-nine thousand, nine hundred ninety-one".