1972316521 has 16 divisors (see below), whose sum is σ = 2310916608. Its totient is φ = 1647993600.

The previous prime is 1972316501. The next prime is 1972316531. The reversal of 1972316521 is 1256132791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1972316521 is a prime.

It is a super-3 number, since 3×1972316521³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1972316501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 535141 + ... + 538813.

It is an arithmetic number, because the mean of its divisors is an integer number (144432288).

Almost surely, 2^1972316521 is an apocalyptic number.

It is an amenable number.

1972316521 is a deficient number, since it is larger than the sum of its proper divisors (338600087).

1972316521 is a wasteful number, since it uses less digits than its factorization.

1972316521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5592.

The product of its digits is 22680, while the sum is 37.

The square root of 1972316521 is about 44410.7703265773. The cubic root of 1972316521 is about 1254.0808539533.

The spelling of 1972316521 in words is "one billion, nine hundred seventy-two million, three hundred sixteen thousand, five hundred twenty-one".