6891407253 has 6 divisors (see below), whose sum is σ = 9954254934. Its totient is φ = 4594271496.

The previous prime is 6891407239. The next prime is 6891407273. The reversal of 6891407253 is 3527041986.

6891407253 is digitally balanced in base 10, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6665416164 + 225991089 = 81642^2 + 15033^2 .

It is not a de Polignac number, because 6891407253 - 2¹² = 6891403157 is a prime.

6891407253 is strictly pandigital in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6891407199 and 6891407208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6891407273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 382855950 + ... + 382855967.

It is an arithmetic number, because the mean of its divisors is an integer number (1659042489).

It is a 1-persistent number, because it is pandigital, but 2⋅6891407253 = 13782814506 is not.

Almost surely, 2^6891407253 is an apocalyptic number.

It is an amenable number.

6891407253 is a deficient number, since it is larger than the sum of its proper divisors (3062847681).

6891407253 is a wasteful number, since it uses less digits than its factorization.

6891407253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765711923 (or 765711920 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 6891407253 is about 83014.5002574851. The cubic root of 6891407253 is about 1902.9876590512.

The spelling of 6891407253 in words is "six billion, eight hundred ninety-one million, four hundred seven thousand, two hundred fifty-three".