97720651 has 6 divisors (see below), whose sum is σ = 113675100. Its totient is φ = 83760516.

The previous prime is 97720627. The next prime is 97720657. The reversal of 97720651 is 15602779.

It is not a de Polignac number, because 97720651 - 2¹⁵ = 97687883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97720651.

It is not an unprimeable number, because it can be changed into a prime (97720657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 997101 + ... + 997198.

It is an arithmetic number, because the mean of its divisors is an integer number (18945850).

Almost surely, 2^97720651 is an apocalyptic number.

97720651 is a deficient number, since it is larger than the sum of its proper divisors (15954449).

97720651 is a wasteful number, since it uses less digits than its factorization.

97720651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994313 (or 1994306 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 97720651 is about 9885.3756124894. The cubic root of 97720651 is about 460.6051440192.

The spelling of 97720651 in words is "ninety-seven million, seven hundred twenty thousand, six hundred fifty-one".