249999157 has 6 divisors (see below), whose sum is σ = 255433718. Its totient is φ = 244677864.

The previous prime is 249999149. The next prime is 249999193. The reversal of 249999157 is 751999942.

It can be written as a sum of positive squares in only one way, i.e., 194853681 + 55145476 = 13959^2 + 7426^2 .

It is not a de Polignac number, because 249999157 - 2³ = 249999149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249999098 and 249999107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249999137) 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, 54378 + ... + 58795.

Almost surely, 2^249999157 is an apocalyptic number.

It is an amenable number.

249999157 is a deficient number, since it is larger than the sum of its proper divisors (5434561).

249999157 is an equidigital number, since it uses as much as digits as its factorization.

249999157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113267 (or 113220 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 55.

The square root of 249999157 is about 15811.3616428187. The cubic root of 249999157 is about 629.9598168710.

The spelling of 249999157 in words is "two hundred forty-nine million, nine hundred ninety-nine thousand, one hundred fifty-seven".