91442736025 has 27 divisors (see below), whose sum is σ = 114339931869. Its totient is φ = 72545770080.

The previous prime is 91442736019. The next prime is 91442736029. The reversal of 91442736025 is 52063724419.

The square root of 91442736025 is 302395.

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 21086234521 + 70356501504 = 145211^2 + 265248^2 .

It is not a de Polignac number, because 91442736025 - 2³ = 91442736017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91442736029) 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 in 26 ways as a sum of consecutive naturals, for example, 297858922 + ... + 297859228.

Almost surely, 2^91442736025 is an apocalyptic number.

91442736025 is the 302395-th square number.

91442736025 is the 151198-th centered octagonal number.

It is an amenable number.

91442736025 is a deficient number, since it is larger than the sum of its proper divisors (22897195844).

91442736025 is an frugal number, since it uses more digits than its factorization.

91442736025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 91442736025 in words is "ninety-one billion, four hundred forty-two million, seven hundred thirty-six thousand, twenty-five".