991325790031 has 2 divisors, whose sum is σ = 991325790032. Its totient is φ = 991325790030.

The previous prime is 991325789957. The next prime is 991325790043. The reversal of 991325790031 is 130097523199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991325790031 - 2¹³ = 991325781839 is a prime.

It is a super-2 number, since 2×991325790031² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991325790431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495662895015 + 495662895016.

It is an arithmetic number, because the mean of its divisors is an integer number (495662895016).

Almost surely, 2^991325790031 is an apocalyptic number.

991325790031 is a deficient number, since it is larger than the sum of its proper divisors (1).

991325790031 is an equidigital number, since it uses as much as digits as its factorization.

991325790031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 459270, while the sum is 49.

The spelling of 991325790031 in words is "nine hundred ninety-one billion, three hundred twenty-five million, seven hundred ninety thousand, thirty-one".