91587943225 has 9 divisors (see below), whose sum is σ = 113570925967. Its totient is φ = 73269144040.

The previous prime is 91587943217. The next prime is 91587943243. The reversal of 91587943225 is 52234978519.

The square root of 91587943225 is 302635.

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

It can be written as a sum of positive squares in only one way, i.e., 32971659561 + 58616283664 = 181581^2 + 242108^2 .

It is not a de Polignac number, because 91587943225 - 2³ = 91587943217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1482912 + ... + 1543438.

Almost surely, 2^91587943225 is an apocalyptic number.

91587943225 is the 302635-th square number.

91587943225 is the 151318-th centered octagonal number.

It is an amenable number.

91587943225 is a deficient number, since it is larger than the sum of its proper divisors (21982982742).

91587943225 is an frugal number, since it uses more digits than its factorization.

91587943225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121064 (or 60532 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 55.

The spelling of 91587943225 in words is "ninety-one billion, five hundred eighty-seven million, nine hundred forty-three thousand, two hundred twenty-five".