1231555242 has 16 divisors (see below), whose sum is σ = 2607999552. Its totient is φ = 386370240.

The previous prime is 1231555231. The next prime is 1231555271. The reversal of 1231555242 is 2425551321.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6036934 + ... + 6037137.

It is an arithmetic number, because the mean of its divisors is an integer number (162999972).

Almost surely, 2^1231555242 is an apocalyptic number.

1231555242 is an abundant number, since it is smaller than the sum of its proper divisors (1376444310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231555242 is a wasteful number, since it uses less digits than its factorization.

1231555242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12074093.

The product of its digits is 12000, while the sum is 30.

The square root of 1231555242 is about 35093.5213679106. The cubic root of 1231555242 is about 1071.8926649838.

The spelling of 1231555242 in words is "one billion, two hundred thirty-one million, five hundred fifty-five thousand, two hundred forty-two".