45249981 has 12 divisors (see below), whose sum is σ = 70183872. Its totient is φ = 25857048.

The previous prime is 45249949. The next prime is 45249989. The reversal of 45249981 is 18994254.

It is not a de Polignac number, because 45249981 - 2⁵ = 45249949 is a prime.

It is a super-2 number, since 2×45249981² = 4095121561000722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45249989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153765 + ... + 154058.

It is an arithmetic number, because the mean of its divisors is an integer number (5848656).

Almost surely, 2^45249981 is an apocalyptic number.

It is an amenable number.

45249981 is a deficient number, since it is larger than the sum of its proper divisors (24933891).

45249981 is a wasteful number, since it uses less digits than its factorization.

45249981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307840 (or 307833 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 45249981 is about 6726.8106112778. The cubic root of 45249981 is about 356.3467484846.

The spelling of 45249981 in words is "forty-five million, two hundred forty-nine thousand, nine hundred eighty-one".