1231146556 has 12 divisors (see below), whose sum is σ = 2161017880. Its totient is φ = 613712880.

The previous prime is 1231146551. The next prime is 1231146583. The reversal of 1231146556 is 6556411321.

It is a super-2 number, since 2×1231146556² = 3031443684701322272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231146551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463611 + ... + 466258.

Almost surely, 2^1231146556 is an apocalyptic number.

It is an amenable number.

1231146556 is a deficient number, since it is larger than the sum of its proper divisors (929871324).

1231146556 is a wasteful number, since it uses less digits than its factorization.

1231146556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930204 (or 930202 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 1231146556 is about 35087.6980721164. The cubic root of 1231146556 is about 1071.7740842991.

Adding to 1231146556 its reverse (6556411321), we get a palindrome (7787557877).

The spelling of 1231146556 in words is "one billion, two hundred thirty-one million, one hundred forty-six thousand, five hundred fifty-six".