98155721 has 4 divisors (see below), whose sum is σ = 98178432. Its totient is φ = 98133012.

The previous prime is 98155711. The next prime is 98155741. The reversal of 98155721 is 12755189.

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.

It is a cyclic number.

It is not a de Polignac number, because 98155721 - 2⁶ = 98155657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98155711) 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, 2645 + ... + 14258.

It is an arithmetic number, because the mean of its divisors is an integer number (24544608).

Almost surely, 2^98155721 is an apocalyptic number.

It is an amenable number.

98155721 is a deficient number, since it is larger than the sum of its proper divisors (22711).

98155721 is a wasteful number, since it uses less digits than its factorization.

98155721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22710.

The product of its digits is 25200, while the sum is 38.

The square root of 98155721 is about 9907.3569129208. The cubic root of 98155721 is about 461.2876978514.

The spelling of 98155721 in words is "ninety-eight million, one hundred fifty-five thousand, seven hundred twenty-one".