97212155 has 4 divisors (see below), whose sum is σ = 116654592. Its totient is φ = 77769720.

The previous prime is 97212149. The next prime is 97212161. The reversal of 97212155 is 55121279.

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 (97212149) and next prime (97212161).

It is not a de Polignac number, because 97212155 - 2⁶ = 97212091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9721211 + ... + 9721220.

It is an arithmetic number, because the mean of its divisors is an integer number (29163648).

Almost surely, 2^97212155 is an apocalyptic number.

97212155 is a deficient number, since it is larger than the sum of its proper divisors (19442437).

97212155 is a wasteful number, since it uses less digits than its factorization.

97212155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19442436.

The product of its digits is 6300, while the sum is 32.

The square root of 97212155 is about 9859.6224572749. The cubic root of 97212155 is about 459.8048242569.

The spelling of 97212155 in words is "ninety-seven million, two hundred twelve thousand, one hundred fifty-five".