91140436 has 6 divisors (see below), whose sum is σ = 159495770. Its totient is φ = 45570216.

The previous prime is 91140419. The next prime is 91140437. The reversal of 91140436 is 63404119.

It can be written as a sum of positive squares in only one way, i.e., 81180100 + 9960336 = 9010^2 + 3156^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91140437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11392551 + ... + 11392558.

Almost surely, 2^91140436 is an apocalyptic number.

It is an amenable number.

91140436 is a deficient number, since it is larger than the sum of its proper divisors (68355334).

91140436 is a wasteful number, since it uses less digits than its factorization.

91140436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22785113 (or 22785111 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 91140436 is about 9546.7500229136. The cubic root of 91140436 is about 450.0254076189.

The spelling of 91140436 in words is "ninety-one million, one hundred forty thousand, four hundred thirty-six".