94009981 has 4 divisors (see below), whose sum is σ = 101241532. Its totient is φ = 86778432.

The previous prime is 94009973. The next prime is 94009987. The reversal of 94009981 is 18990049.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18990049 = 13 ⋅1460773.

It can be written as a sum of positive squares in 2 ways, for example, as 32387481 + 61622500 = 5691^2 + 7850^2 .

It is not a de Polignac number, because 94009981 - 2³ = 94009973 is a prime.

It is a super-2 number, since 2×94009981² = 17675753055240722, 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 (94009987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3615756 + ... + 3615781.

It is an arithmetic number, because the mean of its divisors is an integer number (25310383).

Almost surely, 2^94009981 is an apocalyptic number.

It is an amenable number.

94009981 is a deficient number, since it is larger than the sum of its proper divisors (7231551).

94009981 is a wasteful number, since it uses less digits than its factorization.

94009981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7231550.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 94009981 is about 9695.8744319427. The cubic root of 94009981 is about 454.6996867051.

The spelling of 94009981 in words is "ninety-four million, nine thousand, nine hundred eighty-one".