1981575213 has 8 divisors (see below), whose sum is σ = 2643748800. Its totient is φ = 1320225888.

The previous prime is 1981575209. The next prime is 1981575247. The reversal of 1981575213 is 3125751891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1981575213 - 2² = 1981575209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981575203) 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, 200433 + ... + 210086.

It is an arithmetic number, because the mean of its divisors is an integer number (330468600).

Almost surely, 2^1981575213 is an apocalyptic number.

It is an amenable number.

1981575213 is a deficient number, since it is larger than the sum of its proper divisors (662173587).

1981575213 is a wasteful number, since it uses less digits than its factorization.

1981575213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412131.

The product of its digits is 75600, while the sum is 42.

The square root of 1981575213 is about 44514.8875433826. The cubic root of 1981575213 is about 1256.0401450801.

The spelling of 1981575213 in words is "one billion, nine hundred eighty-one million, five hundred seventy-five thousand, two hundred thirteen".