1020131400991 has 2 divisors, whose sum is σ = 1020131400992. Its totient is φ = 1020131400990.

The previous prime is 1020131400983. The next prime is 1020131401127. The reversal of 1020131400991 is 1990041310201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020131400991 - 2³ = 1020131400983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020131400791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510065700495 + 510065700496.

It is an arithmetic number, because the mean of its divisors is an integer number (510065700496).

Almost surely, 2^{1020131400991} is an apocalyptic number.

1020131400991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020131400991 is an equidigital number, since it uses as much as digits as its factorization.

1020131400991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 1020131400991 in words is "one trillion, twenty billion, one hundred thirty-one million, four hundred thousand, nine hundred ninety-one".