5651521 has 4 divisors (see below), whose sum is σ = 5657344. Its totient is φ = 5645700.

The previous prime is 5651519. The next prime is 5651539. The reversal of 5651521 is 1251565.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 5651521 - 2¹ = 5651519 is a prime.

It is a super-2 number, since 2×5651521² = 63879379226882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5651501) 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, 1065 + ... + 3526.

It is an arithmetic number, because the mean of its divisors is an integer number (1414336).

Almost surely, 2^5651521 is an apocalyptic number.

It is an amenable number.

5651521 is a deficient number, since it is larger than the sum of its proper divisors (5823).

5651521 is a wasteful number, since it uses less digits than its factorization.

5651521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5822.

The product of its digits is 1500, while the sum is 25.

The square root of 5651521 is about 2377.2927880259. The cubic root of 5651521 is about 178.1237304106.

The spelling of 5651521 in words is "five million, six hundred fifty-one thousand, five hundred twenty-one".