97718551 has 4 divisors (see below), whose sum is σ = 111678352. Its totient is φ = 83758752.

The previous prime is 97718549. The next prime is 97718557. The reversal of 97718551 is 15581779.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 97718551 - 2¹ = 97718549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 97718498 and 97718507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97718557) 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 in 3 ways as a sum of consecutive naturals, for example, 6979890 + ... + 6979903.

It is an arithmetic number, because the mean of its divisors is an integer number (27919588).

Almost surely, 2^97718551 is an apocalyptic number.

97718551 is a deficient number, since it is larger than the sum of its proper divisors (13959801).

97718551 is a wasteful number, since it uses less digits than its factorization.

97718551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13959800.

The product of its digits is 88200, while the sum is 43.

The square root of 97718551 is about 9885.2693944070. The cubic root of 97718551 is about 460.6018445538.

The spelling of 97718551 in words is "ninety-seven million, seven hundred eighteen thousand, five hundred fifty-one".