3751521 has 4 divisors (see below), whose sum is σ = 5002032. Its totient is φ = 2501012.

The previous prime is 3751519. The next prime is 3751523. The reversal of 3751521 is 1251573.

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: 1251573 = 3 ⋅417191.

It is an interprime number because it is at equal distance from previous prime (3751519) and next prime (3751523).

It is a cyclic number.

It is not a de Polignac number, because 3751521 - 2¹ = 3751519 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 3751491 and 3751500.

It is not an unprimeable number, because it can be changed into a prime (3751523) 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, 625251 + ... + 625256.

It is an arithmetic number, because the mean of its divisors is an integer number (1250508).

Almost surely, 2^3751521 is an apocalyptic number.

It is an amenable number.

3751521 is a deficient number, since it is larger than the sum of its proper divisors (1250511).

3751521 is a wasteful number, since it uses less digits than its factorization.

3751521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250510.

The product of its digits is 1050, while the sum is 24.

The square root of 3751521 is about 1936.8843538012. The cubic root of 3751521 is about 155.3826273502.

The spelling of 3751521 in words is "three million, seven hundred fifty-one thousand, five hundred twenty-one".