6721461 has 10 divisors (see below), whose sum is σ = 10040822. Its totient is φ = 4480920.

The previous prime is 6721447. The next prime is 6721469. The reversal of 6721461 is 1641276.

6721461 = T₁₀₃ + T₁₀₄ + ... + T₃₄₅.

It can be written as a sum of positive squares in only one way, i.e., 5267025 + 1454436 = 2295^2 + 1206^2 .

It is not a de Polignac number, because 6721461 - 2⁷ = 6721333 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721469) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 41410 + ... + 41571.

Almost surely, 2^6721461 is an apocalyptic number.

It is an amenable number.

6721461 is a deficient number, since it is larger than the sum of its proper divisors (3319361).

6721461 is an equidigital number, since it uses as much as digits as its factorization.

6721461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82993 (or 82984 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 6721461 is about 2592.5780605413. The cubic root of 6721461 is about 188.7214339179.

It can be divided in two parts, 67 and 21461, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 6721461 in words is "six million, seven hundred twenty-one thousand, four hundred sixty-one".