1231210551532 has 48 divisors (see below), whose sum is σ = 2379681722880. Its totient is φ = 553782535488.

The previous prime is 1231210551509. The next prime is 1231210551541. The reversal of 1231210551532 is 2351550121321.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1231210551494 and 1231210551503.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369069 + ... + 1612027.

It is an arithmetic number, because the mean of its divisors is an integer number (49576702560).

Almost surely, 2^{1231210551532} is an apocalyptic number.

It is an amenable number.

1231210551532 is a deficient number, since it is larger than the sum of its proper divisors (1148471171348).

1231210551532 is a wasteful number, since it uses less digits than its factorization.

1231210551532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243462 (or 1243460 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 1231210551532 its reverse (2351550121321), we get a palindrome (3582760672853).

The spelling of 1231210551532 in words is "one trillion, two hundred thirty-one billion, two hundred ten million, five hundred fifty-one thousand, five hundred thirty-two".