45042521 has 4 divisors (see below), whose sum is σ = 47413200. Its totient is φ = 42671844.

The previous prime is 45042511. The next prime is 45042541. The reversal of 45042521 is 12524054.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12524054 = 2 ⋅6262027.

It is a cyclic number.

It is not a de Polignac number, because 45042521 - 2¹⁸ = 44780377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45042511) 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, 1185311 + ... + 1185348.

It is an arithmetic number, because the mean of its divisors is an integer number (11853300).

Almost surely, 2^45042521 is an apocalyptic number.

It is an amenable number.

45042521 is a deficient number, since it is larger than the sum of its proper divisors (2370679).

45042521 is a wasteful number, since it uses less digits than its factorization.

45042521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370678.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 45042521 is about 6711.3725123852. The cubic root of 45042521 is about 355.8013267810.

Adding to 45042521 its reverse (12524054), we get a palindrome (57566575).

The spelling of 45042521 in words is "forty-five million, forty-two thousand, five hundred twenty-one".