2691248257 has 8 divisors (see below), whose sum is σ = 2903323176. Its totient is φ = 2485147392.

The previous prime is 2691248251. The next prime is 2691248279. The reversal of 2691248257 is 7528421962.

It can be written as a sum of positive squares in 4 ways, for example, as 658230336 + 2033017921 = 25656^2 + 45089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2691248257 - 2³ = 2691248249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2691248251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1492578 + ... + 1494379.

It is an arithmetic number, because the mean of its divisors is an integer number (362915397).

Almost surely, 2^2691248257 is an apocalyptic number.

It is an amenable number.

2691248257 is a deficient number, since it is larger than the sum of its proper divisors (212074919).

2691248257 is a wasteful number, since it uses less digits than its factorization.

2691248257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2987027.

The product of its digits is 483840, while the sum is 46.

The square root of 2691248257 is about 51877.2421876877. The cubic root of 2691248257 is about 1390.9705033314.

The spelling of 2691248257 in words is "two billion, six hundred ninety-one million, two hundred forty-eight thousand, two hundred fifty-seven".