91623506 has 16 divisors (see below), whose sum is σ = 156714264. Its totient is φ = 39800064.

The previous prime is 91623503. The next prime is 91623509. The reversal of 91623506 is 60532619.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (91623503) and next prime (91623509).

It can be written as a sum of positive squares in 4 ways, for example, as 77598481 + 14025025 = 8809^2 + 3745^2 .

It is not an unprimeable number, because it can be changed into a prime (91623503) 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 7 ways as a sum of consecutive naturals, for example, 103205 + ... + 104088.

Almost surely, 2^91623506 is an apocalyptic number.

91623506 is a deficient number, since it is larger than the sum of its proper divisors (65090758).

91623506 is a wasteful number, since it uses less digits than its factorization.

91623506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207325.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 91623506 is about 9572.0168198766. The cubic root of 91623506 is about 450.8190941808.

It can be divided in two parts, 91623 and 506, that added together give a palindrome (92129).

The spelling of 91623506 in words is "ninety-one million, six hundred twenty-three thousand, five hundred six".