45493981 has 8 divisors (see below), whose sum is σ = 49918680. Its totient is φ = 41201472.

The previous prime is 45493963. The next prime is 45494017. The reversal of 45493981 is 18939454.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 52900 + 45441081 = 230^2 + 6741^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-45493981 is a prime.

It is a super-2 number, since 2×45493981² = 4139404614456722, 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 (45493901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32326 + ... + 33703.

It is an arithmetic number, because the mean of its divisors is an integer number (6239835).

Almost surely, 2^45493981 is an apocalyptic number.

It is an amenable number.

45493981 is a deficient number, since it is larger than the sum of its proper divisors (4424699).

45493981 is a wasteful number, since it uses less digits than its factorization.

45493981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66095.

The product of its digits is 155520, while the sum is 43.

The square root of 45493981 is about 6744.9226088963. The cubic root of 45493981 is about 356.9861063203.

The spelling of 45493981 in words is "forty-five million, four hundred ninety-three thousand, nine hundred eighty-one".