97650991 has 2 divisors, whose sum is σ = 97650992. Its totient is φ = 97650990.

The previous prime is 97650977. The next prime is 97651003. The reversal of 97650991 is 19905679.

It is a strong prime.

It is an emirp because it is prime and its reverse (19905679) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97650991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97657991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48825495 + 48825496.

It is an arithmetic number, because the mean of its divisors is an integer number (48825496).

Almost surely, 2^97650991 is an apocalyptic number.

97650991 is a deficient number, since it is larger than the sum of its proper divisors (1).

97650991 is an equidigital number, since it uses as much as digits as its factorization.

97650991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 97650991 is about 9881.8515977523. The cubic root of 97650991 is about 460.4956708044.

The spelling of 97650991 in words is "ninety-seven million, six hundred fifty thousand, nine hundred ninety-one".