1972642651 has 16 divisors (see below), whose sum is σ = 2408978880. Its totient is φ = 1576765440.

The previous prime is 1972642621. The next prime is 1972642667. The reversal of 1972642651 is 1562462791.

It is a cyclic number.

It is not a de Polignac number, because 1972642651 - 2⁵ = 1972642619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1972642598 and 1972642607.

It is not an unprimeable number, because it can be changed into a prime (1972642621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63070 + ... + 89011.

It is an arithmetic number, because the mean of its divisors is an integer number (150561180).

Almost surely, 2^1972642651 is an apocalyptic number.

1972642651 is a deficient number, since it is larger than the sum of its proper divisors (436336229).

1972642651 is a wasteful number, since it uses less digits than its factorization.

1972642651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152214.

The product of its digits is 181440, while the sum is 43.

The square root of 1972642651 is about 44414.4419192677. The cubic root of 1972642651 is about 1254.1499724820.

The spelling of 1972642651 in words is "one billion, nine hundred seventy-two million, six hundred forty-two thousand, six hundred fifty-one".