91623061 has 4 divisors (see below), whose sum is σ = 93351852. Its totient is φ = 89894272.

The previous prime is 91623041. The next prime is 91623071. The reversal of 91623061 is 16032619.

91623061 = T₇₈₁₄ + T₇₈₁₅ + T₇₈₁₆.

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 25704900 + 65918161 = 5070^2 + 8119^2 .

It is a cyclic number.

It is not a de Polignac number, because 91623061 - 2⁵ = 91623029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91623001) 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, 864316 + ... + 864421.

It is an arithmetic number, because the mean of its divisors is an integer number (23337963).

Almost surely, 2^91623061 is an apocalyptic number.

91623061 is the 7816-th centered triangular number.

It is an amenable number.

91623061 is a deficient number, since it is larger than the sum of its proper divisors (1728791).

91623061 is a wasteful number, since it uses less digits than its factorization.

91623061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728790.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 91623061 is about 9571.9935750083. The cubic root of 91623061 is about 450.8183643287.

The spelling of 91623061 in words is "ninety-one million, six hundred twenty-three thousand, sixty-one".