97528139 has 4 divisors (see below), whose sum is σ = 100674240. Its totient is φ = 94382040.

The previous prime is 97528127. The next prime is 97528177. The reversal of 97528139 is 93182579.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97528139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 97528139.

It is not an unprimeable number, because it can be changed into a prime (97528339) 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, 1573004 + ... + 1573065.

It is an arithmetic number, because the mean of its divisors is an integer number (25168560).

Almost surely, 2^97528139 is an apocalyptic number.

97528139 is a deficient number, since it is larger than the sum of its proper divisors (3146101).

97528139 is a wasteful number, since it uses less digits than its factorization.

97528139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146100.

The product of its digits is 136080, while the sum is 44.

The square root of 97528139 is about 9875.6335999266. The cubic root of 97528139 is about 460.3024774929.

The spelling of 97528139 in words is "ninety-seven million, five hundred twenty-eight thousand, one hundred thirty-nine".