1231401451749 has 16 divisors (see below), whose sum is σ = 1902849730560. Its totient is φ = 693747295920.

The previous prime is 1231401451723. The next prime is 1231401451769. The reversal of 1231401451749 is 9471541041321.

It is not a de Polignac number, because 1231401451749 - 2⁵ = 1231401451717 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231401451749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231401451769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412943329 + ... + 412946310.

It is an arithmetic number, because the mean of its divisors is an integer number (118928108160).

Almost surely, 2^{1231401451749} is an apocalyptic number.

It is an amenable number.

1231401451749 is a deficient number, since it is larger than the sum of its proper divisors (671448278811).

1231401451749 is an equidigital number, since it uses as much as digits as its factorization.

1231401451749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825889720.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 1231401451749 in words is "one trillion, two hundred thirty-one billion, four hundred one million, four hundred fifty-one thousand, seven hundred forty-nine".