978620981 has 8 divisors (see below), whose sum is σ = 1076323584. Its totient is φ = 884121840.

The previous prime is 978620977. The next prime is 978620983. The reversal of 978620981 is 189026879.

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 978620981 - 2² = 978620977 is a prime.

It is a super-2 number, since 2×978620981² = 1915398048906804722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978620983) 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, 800225 + ... + 801446.

It is an arithmetic number, because the mean of its divisors is an integer number (134540448).

Almost surely, 2^978620981 is an apocalyptic number.

It is an amenable number.

978620981 is a deficient number, since it is larger than the sum of its proper divisors (97702603).

978620981 is a wasteful number, since it uses less digits than its factorization.

978620981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601731.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 978620981 is about 31282.9183581072. The cubic root of 978620981 is about 992.8222637004.

The spelling of 978620981 in words is "nine hundred seventy-eight million, six hundred twenty thousand, nine hundred eighty-one".