1972776515 has 4 divisors (see below), whose sum is σ = 2367331824. Its totient is φ = 1578221208.

The previous prime is 1972776499. The next prime is 1972776521. The reversal of 1972776515 is 5156772791.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1972776515 - 2⁴ = 1972776499 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197277647 + ... + 197277656.

It is an arithmetic number, because the mean of its divisors is an integer number (591832956).

Almost surely, 2^1972776515 is an apocalyptic number.

1972776515 is a deficient number, since it is larger than the sum of its proper divisors (394555309).

1972776515 is an equidigital number, since it uses as much as digits as its factorization.

1972776515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394555308.

The product of its digits is 926100, while the sum is 50.

The square root of 1972776515 is about 44415.9488810044. The cubic root of 1972776515 is about 1254.1783408123.

The spelling of 1972776515 in words is "one billion, nine hundred seventy-two million, seven hundred seventy-six thousand, five hundred fifteen".