97919639 has 4 divisors (see below), whose sum is σ = 98119560. Its totient is φ = 97719720.

The previous prime is 97919621. The next prime is 97919641. The reversal of 97919639 is 93691979.

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

It is a cyclic number.

It is not a de Polignac number, because 97919639 - 2⁸ = 97919383 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 (97919039) 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, 99224 + ... + 100205.

It is an arithmetic number, because the mean of its divisors is an integer number (24529890).

Almost surely, 2^97919639 is an apocalyptic number.

97919639 is a deficient number, since it is larger than the sum of its proper divisors (199921).

97919639 is a wasteful number, since it uses less digits than its factorization.

97919639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199920.

The product of its digits is 826686, while the sum is 53.

The square root of 97919639 is about 9895.4352607654. The cubic root of 97919639 is about 460.9175745840.

The spelling of 97919639 in words is "ninety-seven million, nine hundred nineteen thousand, six hundred thirty-nine".