45121993 has 10 divisors (see below), whose sum is σ = 52641994. Its totient is φ = 38673936.

The previous prime is 45121969. The next prime is 45121997. The reversal of 45121993 is 39912154.

It can be written as a sum of positive squares in only one way, i.e., 41835024 + 3286969 = 6468^2 + 1813^2 .

It is not a de Polignac number, because 45121993 - 2⁹ = 45121481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45121997) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6996 + ... + 11797.

Almost surely, 2^45121993 is an apocalyptic number.

It is an amenable number.

45121993 is a deficient number, since it is larger than the sum of its proper divisors (7520001).

45121993 is an frugal number, since it uses more digits than its factorization.

45121993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18821 (or 18800 counting only the distinct ones).

The product of its digits is 9720, while the sum is 34.

The square root of 45121993 is about 6717.2905996391. The cubic root of 45121993 is about 356.0104597566.

The spelling of 45121993 in words is "forty-five million, one hundred twenty-one thousand, nine hundred ninety-three".