91038737 has 4 divisors (see below), whose sum is σ = 93259236. Its totient is φ = 88818240.

The previous prime is 91038691. The next prime is 91038751. The reversal of 91038737 is 73783019.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14318656 + 76720081 = 3784^2 + 8759^2 .

It is a cyclic number.

It is not a de Polignac number, because 91038737 - 2¹² = 91034641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91038737.

It is not an unprimeable number, because it can be changed into a prime (91031737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1110188 + ... + 1110269.

It is an arithmetic number, because the mean of its divisors is an integer number (23314809).

Almost surely, 2^91038737 is an apocalyptic number.

It is an amenable number.

91038737 is a deficient number, since it is larger than the sum of its proper divisors (2220499).

91038737 is a wasteful number, since it uses less digits than its factorization.

91038737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220498.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 91038737 is about 9541.4221686287. The cubic root of 91038737 is about 449.8579584618.

The spelling of 91038737 in words is "ninety-one million, thirty-eight thousand, seven hundred thirty-seven".