811121542 has 64 divisors (see below), whose sum is σ = 1605049344. Its totient is φ = 298045440.

The previous prime is 811121539. The next prime is 811121543. The reversal of 811121542 is 245121118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811121543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256998 + ... + 260134.

It is an arithmetic number, because the mean of its divisors is an integer number (25078896).

Almost surely, 2^811121542 is an apocalyptic number.

811121542 is a deficient number, since it is larger than the sum of its proper divisors (793927802).

811121542 is a wasteful number, since it uses less digits than its factorization.

811121542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3253.

The product of its digits is 640, while the sum is 25.

The square root of 811121542 is about 28480.1956102833. The cubic root of 811121542 is about 932.5997869193.

The spelling of 811121542 in words is "eight hundred eleven million, one hundred twenty-one thousand, five hundred forty-two".