98947721 has 4 divisors (see below), whose sum is σ = 98968212. Its totient is φ = 98927232.

The previous prime is 98947613. The next prime is 98947727. The reversal of 98947721 is 12774989.

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

It can be written as a sum of positive squares in 2 ways, for example, as 64561225 + 34386496 = 8035^2 + 5864^2 .

It is a cyclic number.

It is not a de Polignac number, because 98947721 - 2²⁶ = 31838857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (98947727) 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, 1445 + ... + 14141.

It is an arithmetic number, because the mean of its divisors is an integer number (24742053).

Almost surely, 2^98947721 is an apocalyptic number.

It is an amenable number.

98947721 is a deficient number, since it is larger than the sum of its proper divisors (20491).

98947721 is a wasteful number, since it uses less digits than its factorization.

98947721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20490.

The product of its digits is 254016, while the sum is 47.

The square root of 98947721 is about 9947.2469055513. The cubic root of 98947721 is about 462.5250569332.

The spelling of 98947721 in words is "ninety-eight million, nine hundred forty-seven thousand, seven hundred twenty-one".