91500109 has 2 divisors, whose sum is σ = 91500110. Its totient is φ = 91500108.

The previous prime is 91500089. The next prime is 91500119. The reversal of 91500109 is 90100519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87946884 + 3553225 = 9378^2 + 1885^2 .

It is an emirp because it is prime and its reverse (90100519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91500109 - 2⁷ = 91499981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91500119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45750054 + 45750055.

It is an arithmetic number, because the mean of its divisors is an integer number (45750055).

Almost surely, 2^91500109 is an apocalyptic number.

It is an amenable number.

91500109 is a deficient number, since it is larger than the sum of its proper divisors (1).

91500109 is an equidigital number, since it uses as much as digits as its factorization.

91500109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 91500109 is about 9565.5689323741. The cubic root of 91500109 is about 450.6166180600.

The spelling of 91500109 in words is "ninety-one million, five hundred thousand, one hundred nine".