52145621 has 4 divisors (see below), whose sum is σ = 56886144. Its totient is φ = 47405100.

The previous prime is 52145591. The next prime is 52145641. The reversal of 52145621 is 12654125.

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 52145621 - 2¹⁰ = 52144597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52145641) 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, 2370245 + ... + 2370266.

It is an arithmetic number, because the mean of its divisors is an integer number (14221536).

Almost surely, 2^52145621 is an apocalyptic number.

It is an amenable number.

52145621 is a deficient number, since it is larger than the sum of its proper divisors (4740523).

52145621 is a wasteful number, since it uses less digits than its factorization.

52145621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4740522.

The product of its digits is 2400, while the sum is 26.

The square root of 52145621 is about 7221.1924915487. The cubic root of 52145621 is about 373.5992089031.

Adding to 52145621 its reverse (12654125), we get a palindrome (64799746).

The spelling of 52145621 in words is "fifty-two million, one hundred forty-five thousand, six hundred twenty-one".