45211581 has 8 divisors (see below), whose sum is σ = 66980160. Its totient is φ = 30141036.

The previous prime is 45211571. The next prime is 45211589. The reversal of 45211581 is 18511254.

It is not a de Polignac number, because 45211581 - 2⁵ = 45211549 is a prime.

It is a super-2 number, since 2×45211581² = 4088174113039122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1674503 = 45211581 / (4 + 5 + 2 + 1 + 1 + 5 + 8 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45211589) 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, 837225 + ... + 837278.

It is an arithmetic number, because the mean of its divisors is an integer number (8372520).

Almost surely, 2^45211581 is an apocalyptic number.

It is an amenable number.

45211581 is a deficient number, since it is larger than the sum of its proper divisors (21768579).

45211581 is a wasteful number, since it uses less digits than its factorization.

45211581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674512 (or 1674506 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 45211581 is about 6723.9557553571. The cubic root of 45211581 is about 356.2459190668.

The spelling of 45211581 in words is "forty-five million, two hundred eleven thousand, five hundred eighty-one".