97161551 has 4 divisors (see below), whose sum is σ = 97650000. Its totient is φ = 96673104.

The previous prime is 97161539. The next prime is 97161563. The reversal of 97161551 is 15516179.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (97161539) and next prime (97161563).

It is a cyclic number.

It is not a de Polignac number, because 97161551 - 2⁶ = 97161487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97161151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243926 + ... + 244323.

It is an arithmetic number, because the mean of its divisors is an integer number (24412500).

Almost surely, 2^97161551 is an apocalyptic number.

97161551 is a deficient number, since it is larger than the sum of its proper divisors (488449).

97161551 is a wasteful number, since it uses less digits than its factorization.

97161551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488448.

The product of its digits is 9450, while the sum is 35.

The square root of 97161551 is about 9857.0558992024. The cubic root of 97161551 is about 459.7250262732.

The spelling of 97161551 in words is "ninety-seven million, one hundred sixty-one thousand, five hundred fifty-one".