45785921 has 4 divisors (see below), whose sum is σ = 45802692. Its totient is φ = 45769152.

The previous prime is 45785911. The next prime is 45785923. The reversal of 45785921 is 12958754.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13987600 + 31798321 = 3740^2 + 5639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45785921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45785923) 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, 3236 + ... + 10101.

It is an arithmetic number, because the mean of its divisors is an integer number (11450673).

Almost surely, 2^45785921 is an apocalyptic number.

It is an amenable number.

45785921 is a deficient number, since it is larger than the sum of its proper divisors (16771).

45785921 is a wasteful number, since it uses less digits than its factorization.

45785921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16770.

The product of its digits is 100800, while the sum is 41.

The square root of 45785921 is about 6766.5294649473. The cubic root of 45785921 is about 357.7480854190.

The spelling of 45785921 in words is "forty-five million, seven hundred eighty-five thousand, nine hundred twenty-one".