94001581 has 4 divisors (see below), whose sum is σ = 94022172. Its totient is φ = 93980992.

The previous prime is 94001527. The next prime is 94001587. The reversal of 94001581 is 18510049.

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 7344100 + 86657481 = 2710^2 + 9309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-94001581 is a prime.

It is a super-2 number, since 2×94001581² = 17672594460999122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (94001587) 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, 46 + ... + 13711.

It is an arithmetic number, because the mean of its divisors is an integer number (23505543).

Almost surely, 2^94001581 is an apocalyptic number.

It is an amenable number.

94001581 is a deficient number, since it is larger than the sum of its proper divisors (20591).

94001581 is a wasteful number, since it uses less digits than its factorization.

94001581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20590.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 94001581 is about 9695.4412483393. The cubic root of 94001581 is about 454.6861434937.

The spelling of 94001581 in words is "ninety-four million, one thousand, five hundred eighty-one".