1012431440191 has 4 divisors (see below), whose sum is σ = 1013747996800. Its totient is φ = 1011114883584.

The previous prime is 1012431440177. The next prime is 1012431440219. The reversal of 1012431440191 is 1910441342101.

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-1012431440191 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 (1012431440291) 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, 658277151 + ... + 658278688.

It is an arithmetic number, because the mean of its divisors is an integer number (253436999200).

Almost surely, 2^{1012431440191} is an apocalyptic number.

1012431440191 is a deficient number, since it is larger than the sum of its proper divisors (1316556609).

1012431440191 is an equidigital number, since it uses as much as digits as its factorization.

1012431440191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316556608.

The product of its (nonzero) digits is 3456, while the sum is 31.

Adding to 1012431440191 its reverse (1910441342101), we get a palindrome (2922872782292).

The spelling of 1012431440191 in words is "one trillion, twelve billion, four hundred thirty-one million, four hundred forty thousand, one hundred ninety-one".