98172557 has 4 divisors (see below), whose sum is σ = 112197216. Its totient is φ = 84147900.

The previous prime is 98172553. The next prime is 98172559. The reversal of 98172557 is 75527189.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75527189 = 607 ⋅124427.

It is a cyclic number.

It is not a de Polignac number, because 98172557 - 2² = 98172553 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 (98172553) 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, 7012319 + ... + 7012332.

It is an arithmetic number, because the mean of its divisors is an integer number (28049304).

Almost surely, 2^98172557 is an apocalyptic number.

It is an amenable number.

98172557 is a deficient number, since it is larger than the sum of its proper divisors (14024659).

98172557 is a wasteful number, since it uses less digits than its factorization.

98172557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14024658.

The product of its digits is 176400, while the sum is 44.

The square root of 98172557 is about 9908.2065481095. The cubic root of 98172557 is about 461.3140702170.

The spelling of 98172557 in words is "ninety-eight million, one hundred seventy-two thousand, five hundred fifty-seven".