45137781 has 12 divisors (see below), whose sum is σ = 70214508. Its totient is φ = 27777024.

The previous prime is 45137747. The next prime is 45137783. The reversal of 45137781 is 18773154.

It can be written as a sum of positive squares in 2 ways, for example, as 22184100 + 22953681 = 4710^2 + 4791^2 .

It is not a de Polignac number, because 45137781 - 2¹⁰ = 45136757 is a prime.

It is a super-2 number, since 2×45137781² = 4074838547207922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45137783) 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, 192780 + ... + 193013.

It is an arithmetic number, because the mean of its divisors is an integer number (5851209).

Almost surely, 2^45137781 is an apocalyptic number.

It is an amenable number.

45137781 is a deficient number, since it is larger than the sum of its proper divisors (25076727).

45137781 is a wasteful number, since it uses less digits than its factorization.

45137781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385812 (or 385809 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 45137781 is about 6718.4656730536. The cubic root of 45137781 is about 356.0519771139.

The spelling of 45137781 in words is "forty-five million, one hundred thirty-seven thousand, seven hundred eighty-one".