45457781 has 4 divisors (see below), whose sum is σ = 45473952. Its totient is φ = 45441612.

The previous prime is 45457759. The next prime is 45457787. The reversal of 45457781 is 18775454.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 45457781 - 2⁶ = 45457717 is a prime.

It is a super-2 number, since 2×45457781² = 4132819706887922, 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 (45457787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2651 + ... + 9896.

It is an arithmetic number, because the mean of its divisors is an integer number (11368488).

Almost surely, 2^45457781 is an apocalyptic number.

It is an amenable number.

45457781 is a deficient number, since it is larger than the sum of its proper divisors (16171).

45457781 is a wasteful number, since it uses less digits than its factorization.

45457781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16170.

The product of its digits is 156800, while the sum is 41.

The square root of 45457781 is about 6742.2385748355. The cubic root of 45457781 is about 356.8913954311.

The spelling of 45457781 in words is "forty-five million, four hundred fifty-seven thousand, seven hundred eighty-one".