977621973 has 4 divisors (see below), whose sum is σ = 1303495968. Its totient is φ = 651747980.

The previous prime is 977621971. The next prime is 977621993. The reversal of 977621973 is 379126779.

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 977621973 - 2¹ = 977621971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977621971) 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, 162936993 + ... + 162936998.

It is an arithmetic number, because the mean of its divisors is an integer number (325873992).

Almost surely, 2^977621973 is an apocalyptic number.

It is an amenable number.

977621973 is a deficient number, since it is larger than the sum of its proper divisors (325873995).

977621973 is a wasteful number, since it uses less digits than its factorization.

977621973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325873994.

The product of its digits is 1000188, while the sum is 51.

The square root of 977621973 is about 31266.9469728018. The cubic root of 977621973 is about 992.4843136343.

The spelling of 977621973 in words is "nine hundred seventy-seven million, six hundred twenty-one thousand, nine hundred seventy-three".