45149781 has 16 divisors (see below), whose sum is σ = 62496000. Its totient is φ = 28959168.

The previous prime is 45149779. The next prime is 45149791. The reversal of 45149781 is 18794154.

It is not a de Polignac number, because 45149781 - 2¹ = 45149779 is a prime.

It is a super-2 number, since 2×45149781² = 4077005448695922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45149701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29620 + ... + 31106.

It is an arithmetic number, because the mean of its divisors is an integer number (3906000).

Almost surely, 2^45149781 is an apocalyptic number.

It is an amenable number.

45149781 is a deficient number, since it is larger than the sum of its proper divisors (17346219).

45149781 is a wasteful number, since it uses less digits than its factorization.

45149781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868.

The product of its digits is 40320, while the sum is 39.

The square root of 45149781 is about 6719.3586747546. The cubic root of 45149781 is about 356.0835267755.

The spelling of 45149781 in words is "forty-five million, one hundred forty-nine thousand, seven hundred eighty-one".