1231340012551 has 8 divisors (see below), whose sum is σ = 1344916174608. Its totient is φ = 1118036544000.

The previous prime is 1231340012543. The next prime is 1231340012587. The reversal of 1231340012551 is 1552100431321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231340012551 - 2³ = 1231340012543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231340012051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68163930 + ... + 68181991.

It is an arithmetic number, because the mean of its divisors is an integer number (168114521826).

Almost surely, 2^{1231340012551} is an apocalyptic number.

1231340012551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231340012551 is a deficient number, since it is larger than the sum of its proper divisors (113576162057).

1231340012551 is a wasteful number, since it uses less digits than its factorization.

1231340012551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136346753.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 1231340012551 its reverse (1552100431321), we get a palindrome (2783440443872).

The spelling of 1231340012551 in words is "one trillion, two hundred thirty-one billion, three hundred forty million, twelve thousand, five hundred fifty-one".