91151863487 has 2 divisors, whose sum is σ = 91151863488. Its totient is φ = 91151863486.

The previous prime is 91151863447. The next prime is 91151863549. The reversal of 91151863487 is 78436815119.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91151863487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91151863427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45575931743 + 45575931744.

It is an arithmetic number, because the mean of its divisors is an integer number (45575931744).

Almost surely, 2^91151863487 is an apocalyptic number.

91151863487 is a deficient number, since it is larger than the sum of its proper divisors (1).

91151863487 is an equidigital number, since it uses as much as digits as its factorization.

91151863487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 53.

The spelling of 91151863487 in words is "ninety-one billion, one hundred fifty-one million, eight hundred sixty-three thousand, four hundred eighty-seven".