1992975561 has 12 divisors (see below), whose sum is σ = 2884518000. Its totient is φ = 1325984760.

The previous prime is 1992975547. The next prime is 1992975563. The reversal of 1992975561 is 1655792991.

1992975561 is a `hidden beast` number, since 1 + 9 + 9 + 2 + 9 + 75 + 561 = 666.

It is not a de Polignac number, because 1992975561 - 2⁵ = 1992975529 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1992975498 and 1992975507.

It is not an unprimeable number, because it can be changed into a prime (1992975563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217395 + ... + 226376.

It is an arithmetic number, because the mean of its divisors is an integer number (240376500).

Almost surely, 2^1992975561 is an apocalyptic number.

It is an amenable number.

1992975561 is a deficient number, since it is larger than the sum of its proper divisors (891542439).

1992975561 is a wasteful number, since it uses less digits than its factorization.

1992975561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444276 (or 444273 counting only the distinct ones).

The product of its digits is 1530900, while the sum is 54.

The square root of 1992975561 is about 44642.7548545114. The cubic root of 1992975561 is about 1258.4442798696. Note that the first 3 decimals are identical.

The spelling of 1992975561 in words is "one billion, nine hundred ninety-two million, nine hundred seventy-five thousand, five hundred sixty-one".