1231401451751 has 4 divisors (see below), whose sum is σ = 1231403914104. Its totient is φ = 1231398989400.

The previous prime is 1231401451723. The next prime is 1231401451769. The reversal of 1231401451751 is 1571541041321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231401451751 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 (1231401451711) 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, 184340 + ... + 1580121.

It is an arithmetic number, because the mean of its divisors is an integer number (307850978526).

Almost surely, 2^{1231401451751} is an apocalyptic number.

1231401451751 is a deficient number, since it is larger than the sum of its proper divisors (2462353).

1231401451751 is an equidigital number, since it uses as much as digits as its factorization.

1231401451751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462352.

The product of its (nonzero) digits is 16800, while the sum is 35.

The spelling of 1231401451751 in words is "one trillion, two hundred thirty-one billion, four hundred one million, four hundred fifty-one thousand, seven hundred fifty-one".