4249691257 has 6 divisors (see below), whose sum is σ = 4943518458. Its totient is φ = 3642592464.

The previous prime is 4249691249. The next prime is 4249691269. The reversal of 4249691257 is 7521969424.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2184534121 + 2065157136 = 46739^2 + 45444^2 .

It is not a de Polignac number, because 4249691257 - 2³ = 4249691249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 86728393 = 4249691257 / (4 + 2 + 4 + 9 + 6 + 9 + 1 + 2 + 5 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4249691257.

It is not an unprimeable number, because it can be changed into a prime (4249691207) 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, 43364148 + ... + 43364245.

It is an arithmetic number, because the mean of its divisors is an integer number (823919743).

Almost surely, 2^4249691257 is an apocalyptic number.

It is an amenable number.

4249691257 is a deficient number, since it is larger than the sum of its proper divisors (693827201).

4249691257 is an equidigital number, since it uses as much as digits as its factorization.

4249691257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86728407 (or 86728400 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 49.

The square root of 4249691257 is about 65189.6560583042. The cubic root of 4249691257 is about 1619.7666758667.

The spelling of 4249691257 in words is "four billion, two hundred forty-nine million, six hundred ninety-one thousand, two hundred fifty-seven".