97210991 has 2 divisors, whose sum is σ = 97210992. Its totient is φ = 97210990.

The previous prime is 97210979. The next prime is 97211047. The reversal of 97210991 is 19901279.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97210991 - 2²² = 93016687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97210391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48605495 + 48605496.

It is an arithmetic number, because the mean of its divisors is an integer number (48605496).

Almost surely, 2^97210991 is an apocalyptic number.

97210991 is a deficient number, since it is larger than the sum of its proper divisors (1).

97210991 is an equidigital number, since it uses as much as digits as its factorization.

97210991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 97210991 is about 9859.5634284688. The cubic root of 97210991 is about 459.8029890442.

The spelling of 97210991 in words is "ninety-seven million, two hundred ten thousand, nine hundred ninety-one".