1231211542 has 24 divisors (see below), whose sum is σ = 2054463768. Its totient is φ = 552889920.

The previous prime is 1231211521. The next prime is 1231211557. The reversal of 1231211542 is 2451121321.

It is a super-2 number, since 2×1231211542² = 3031763722308035528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10563 + ... + 50734.

It is an arithmetic number, because the mean of its divisors is an integer number (85602657).

Almost surely, 2^1231211542 is an apocalyptic number.

1231211542 is a deficient number, since it is larger than the sum of its proper divisors (823252226).

1231211542 is a wasteful number, since it uses less digits than its factorization.

1231211542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61404 (or 61393 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 1231211542 is about 35088.6241109565. The cubic root of 1231211542 is about 1071.7929418118.

Adding to 1231211542 its reverse (2451121321), we get a palindrome (3682332863).

The spelling of 1231211542 in words is "one billion, two hundred thirty-one million, two hundred eleven thousand, five hundred forty-two".