91250513929 has 9 divisors (see below), whose sum is σ = 91589184981. Its totient is φ = 90913093920.

The previous prime is 91250513909. The next prime is 91250513933. The reversal of 91250513929 is 92931505219.

The square root of 91250513929 is 302077.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 39970005625 + 51280508304 = 199925^2 + 226452^2 .

It is not a de Polignac number, because 91250513929 - 2¹³ = 91250505737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91250513909) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 138048859 + ... + 138049519.

It is an arithmetic number, because the mean of its divisors is an integer number (10176576109).

Almost surely, 2^91250513929 is an apocalyptic number.

91250513929 is the 302077-th square number.

91250513929 is the 151039-th centered octagonal number.

It is an amenable number.

91250513929 is a deficient number, since it is larger than the sum of its proper divisors (338671052).

91250513929 is an frugal number, since it uses more digits than its factorization.

91250513929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236 (or 1118 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 46.

The spelling of 91250513929 in words is "ninety-one billion, two hundred fifty million, five hundred thirteen thousand, nine hundred twenty-nine".