1972724569 has 4 divisors (see below), whose sum is σ = 1977004260. Its totient is φ = 1968444880.

The previous prime is 1972724527. The next prime is 1972724639. The reversal of 1972724569 is 9654272791.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1308992400 + 663732169 = 36180^2 + 25763^2 .

It is a cyclic number.

It is not a de Polignac number, because 1972724569 - 2²⁵ = 1939170137 is a prime.

It is a super-3 number, since 3×1972724569³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1972724669) 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 3 ways as a sum of consecutive naturals, for example, 2139154 + ... + 2140075.

It is an arithmetic number, because the mean of its divisors is an integer number (494251065).

Almost surely, 2^1972724569 is an apocalyptic number.

It is an amenable number.

1972724569 is a deficient number, since it is larger than the sum of its proper divisors (4279691).

1972724569 is an equidigital number, since it uses as much as digits as its factorization.

1972724569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279690.

The product of its digits is 1905120, while the sum is 52.

The square root of 1972724569 is about 44415.3641097312. The cubic root of 1972724569 is about 1254.1673326182.

The spelling of 1972724569 in words is "one billion, nine hundred seventy-two million, seven hundred twenty-four thousand, five hundred sixty-nine".