91405498531 has 2 divisors, whose sum is σ = 91405498532. Its totient is φ = 91405498530.

The previous prime is 91405498423. The next prime is 91405498543. The reversal of 91405498531 is 13589450419.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91405498531 is a prime.

It is a super-2 number, since 2×91405498531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91405498571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45702749265 + 45702749266.

It is an arithmetic number, because the mean of its divisors is an integer number (45702749266).

Almost surely, 2^91405498531 is an apocalyptic number.

91405498531 is a deficient number, since it is larger than the sum of its proper divisors (1).

91405498531 is an equidigital number, since it uses as much as digits as its factorization.

91405498531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 91405498531 in words is "ninety-one billion, four hundred five million, four hundred ninety-eight thousand, five hundred thirty-one".