978432101 has 4 divisors (see below), whose sum is σ = 978518604. Its totient is φ = 978345600.

The previous prime is 978432097. The next prime is 978432149. The reversal of 978432101 is 101234879.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 92179201 + 886252900 = 9601^2 + 29770^2 .

It is a cyclic number.

It is not a de Polignac number, because 978432101 - 2² = 978432097 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 (978432001) 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, 23180 + ... + 49941.

It is an arithmetic number, because the mean of its divisors is an integer number (244629651).

Almost surely, 2^978432101 is an apocalyptic number.

It is an amenable number.

978432101 is a deficient number, since it is larger than the sum of its proper divisors (86503).

978432101 is a wasteful number, since it uses less digits than its factorization.

978432101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86502.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 978432101 is about 31279.8993124978. The cubic root of 978432101 is about 992.7583859450.

The spelling of 978432101 in words is "nine hundred seventy-eight million, four hundred thirty-two thousand, one hundred one".