97720751 has 2 divisors, whose sum is σ = 97720752. Its totient is φ = 97720750.

The previous prime is 97720673. The next prime is 97720769. The reversal of 97720751 is 15702779.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97720751 - 2¹⁴ = 97704367 is a prime.

It is equal to p_5637773 and since 97720751 and 5637773 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97720351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48860375 + 48860376.

It is an arithmetic number, because the mean of its divisors is an integer number (48860376).

Almost surely, 2^97720751 is an apocalyptic number.

97720751 is a deficient number, since it is larger than the sum of its proper divisors (1).

97720751 is an equidigital number, since it uses as much as digits as its factorization.

97720751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30870, while the sum is 38.

The square root of 97720751 is about 9885.3806704648. The cubic root of 97720751 is about 460.6053011354.

The spelling of 97720751 in words is "ninety-seven million, seven hundred twenty thousand, seven hundred fifty-one".