91073537 has 4 divisors (see below), whose sum is σ = 95033280. Its totient is φ = 87113796.

The previous prime is 91073531. The next prime is 91073561. The reversal of 91073537 is 73537019.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91073537 - 2¹² = 91069441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91073497 and 91073506.

It is not an unprimeable number, because it can be changed into a prime (91073531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1979837 + ... + 1979882.

It is an arithmetic number, because the mean of its divisors is an integer number (23758320).

Almost surely, 2^91073537 is an apocalyptic number.

It is an amenable number.

91073537 is a deficient number, since it is larger than the sum of its proper divisors (3959743).

91073537 is a wasteful number, since it uses less digits than its factorization.

91073537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3959742.

The product of its (nonzero) digits is 19845, while the sum is 35.

The square root of 91073537 is about 9543.2456219045. The cubic root of 91073537 is about 449.9152712906.

It can be divided in two parts, 910 and 73537, that added together give a palindrome (74447).

The spelling of 91073537 in words is "ninety-one million, seventy-three thousand, five hundred thirty-seven".