978201521 has 8 divisors (see below), whose sum is σ = 1068069888. Its totient is φ = 888490000.

The previous prime is 978201517. The next prime is 978201547. The reversal of 978201521 is 125102879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 978201521 - 2² = 978201517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978201571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25970 + ... + 51291.

It is an arithmetic number, because the mean of its divisors is an integer number (133508736).

Almost surely, 2^978201521 is an apocalyptic number.

It is an amenable number.

978201521 is a deficient number, since it is larger than the sum of its proper divisors (89868367).

978201521 is a wasteful number, since it uses less digits than its factorization.

978201521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78423.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 978201521 is about 31276.2133417714. The cubic root of 978201521 is about 992.6803944275.

The spelling of 978201521 in words is "nine hundred seventy-eight million, two hundred one thousand, five hundred twenty-one".