7525621 has 4 divisors (see below), whose sum is σ = 7539552. Its totient is φ = 7511692.

The previous prime is 7525613. The next prime is 7525633. The reversal of 7525621 is 1265257.

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: 1265257 = 7 ⋅180751.

It is a cyclic number.

It is not a de Polignac number, because 7525621 - 2³ = 7525613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7525621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7525601) 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, 6121 + ... + 7246.

It is an arithmetic number, because the mean of its divisors is an integer number (1884888).

Almost surely, 2^7525621 is an apocalyptic number.

It is an amenable number.

7525621 is a deficient number, since it is larger than the sum of its proper divisors (13931).

7525621 is a wasteful number, since it uses less digits than its factorization.

7525621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13930.

The product of its digits is 4200, while the sum is 28.

The square root of 7525621 is about 2743.2865326101. The cubic root of 7525621 is about 195.9660238899.

The spelling of 7525621 in words is "seven million, five hundred twenty-five thousand, six hundred twenty-one".