1997185115524 has 27 divisors (see below), whose sum is σ = 3503647003311. Its totient is φ = 996149103840.

The previous prime is 1997185115521. The next prime is 1997185115573. The reversal of 1997185115524 is 4255115817991.

The square root of 1997185115524 is 1413218.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 154541761924 + 1842643353600 = 393118^2 + 1357440^2 .

It is a super-2 number, since 2×1997185115524² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997185115521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1868273662 + ... + 1868274730.

Almost surely, 2^{1997185115524} is an apocalyptic number.

1997185115524 is the 1413218-th square number.

It is an amenable number.

1997185115524 is a deficient number, since it is larger than the sum of its proper divisors (1506461887787).

1997185115524 is an frugal number, since it uses more digits than its factorization.

1997185115524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3464 (or 1732 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 58.

The spelling of 1997185115524 in words is "one trillion, nine hundred ninety-seven billion, one hundred eighty-five million, one hundred fifteen thousand, five hundred twenty-four".