91500005251 has 2 divisors, whose sum is σ = 91500005252. Its totient is φ = 91500005250.

The previous prime is 91500005243. The next prime is 91500005287. The reversal of 91500005251 is 15250000519.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91500005251 - 2³ = 91500005243 is a prime.

It is not a weakly prime, because it can be changed into another prime (91500005221) 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, 45750002625 + 45750002626.

It is an arithmetic number, because the mean of its divisors is an integer number (45750002626).

Almost surely, 2^91500005251 is an apocalyptic number.

91500005251 is a deficient number, since it is larger than the sum of its proper divisors (1).

91500005251 is an equidigital number, since it uses as much as digits as its factorization.

91500005251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 28.

The spelling of 91500005251 in words is "ninety-one billion, five hundred million, five thousand, two hundred fifty-one".