1972721519 has 8 divisors (see below), whose sum is σ = 2021469072. Its totient is φ = 1924004160.

The previous prime is 1972721473. The next prime is 1972721551. The reversal of 1972721519 is 9151272791.

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 1972721519 - 2⁸ = 1972721263 is a prime.

It is a super-2 number, since 2×1972721519² = 7783260383051334722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1972721519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1972721419) 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, 183497 + ... + 193949.

It is an arithmetic number, because the mean of its divisors is an integer number (252683634).

Almost surely, 2^1972721519 is an apocalyptic number.

1972721519 is a deficient number, since it is larger than the sum of its proper divisors (48747553).

1972721519 is a wasteful number, since it uses less digits than its factorization.

1972721519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15097.

The product of its digits is 79380, while the sum is 44.

The square root of 1972721519 is about 44415.3297747523. The cubic root of 1972721519 is about 1254.1666862681.

The spelling of 1972721519 in words is "one billion, nine hundred seventy-two million, seven hundred twenty-one thousand, five hundred nineteen".