1531137042691 has 2 divisors, whose sum is σ = 1531137042692. Its totient is φ = 1531137042690.

The previous prime is 1531137042683. The next prime is 1531137042697. The reversal of 1531137042691 is 1962407311351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1531137042691 - 2³ = 1531137042683 is a prime.

It is not a weakly prime, because it can be changed into another prime (1531137042697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765568521345 + 765568521346.

It is an arithmetic number, because the mean of its divisors is an integer number (765568521346).

Almost surely, 2^{1531137042691} is an apocalyptic number.

1531137042691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531137042691 is an equidigital number, since it uses as much as digits as its factorization.

1531137042691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 1531137042691 in words is "one trillion, five hundred thirty-one billion, one hundred thirty-seven million, forty-two thousand, six hundred ninety-one".