6253721 has 4 divisors (see below), whose sum is σ = 6263844. Its totient is φ = 6243600.

The previous prime is 6253711. The next prime is 6253727. The reversal of 6253721 is 1273526.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1273526 = 2 ⋅636763.

It can be written as a sum of positive squares in 2 ways, for example, as 4840000 + 1413721 = 2200^2 + 1189^2 .

It is a cyclic number.

It is not a de Polignac number, because 6253721 - 2²² = 2059417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6253727) 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, 4070 + ... + 5391.

It is an arithmetic number, because the mean of its divisors is an integer number (1565961).

Almost surely, 2^6253721 is an apocalyptic number.

It is an amenable number.

6253721 is a deficient number, since it is larger than the sum of its proper divisors (10123).

6253721 is an equidigital number, since it uses as much as digits as its factorization.

6253721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10122.

The product of its digits is 2520, while the sum is 26.

The square root of 6253721 is about 2500.7440892662. The cubic root of 6253721 is about 184.2381230964.

It can be divided in two parts, 625 and 3721, that multiplied together give a square (2325625 = 1525²).

The spelling of 6253721 in words is "six million, two hundred fifty-three thousand, seven hundred twenty-one".