45661421 has 4 divisors (see below), whose sum is σ = 49173852. Its totient is φ = 42148992.

The previous prime is 45661391. The next prime is 45661471. The reversal of 45661421 is 12416654.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12416654 = 2 ⋅6208327.

It can be written as a sum of positive squares in 2 ways, for example, as 2758921 + 42902500 = 1661^2 + 6550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45661421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45661471) 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, 1756196 + ... + 1756221.

It is an arithmetic number, because the mean of its divisors is an integer number (12293463).

Almost surely, 2^45661421 is an apocalyptic number.

It is an amenable number.

45661421 is a deficient number, since it is larger than the sum of its proper divisors (3512431).

45661421 is a wasteful number, since it uses less digits than its factorization.

45661421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3512430.

The product of its digits is 5760, while the sum is 29.

The square root of 45661421 is about 6757.3235086090. The cubic root of 45661421 is about 357.4235310062.

The spelling of 45661421 in words is "forty-five million, six hundred sixty-one thousand, four hundred twenty-one".