1249914157 has 4 divisors (see below), whose sum is σ = 1259037756. Its totient is φ = 1240790560.

The previous prime is 1249914091. The next prime is 1249914163. The reversal of 1249914157 is 7514199421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 805083876 + 444830281 = 28374^2 + 21091^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1249914157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249914557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4561594 + ... + 4561867.

It is an arithmetic number, because the mean of its divisors is an integer number (314759439).

Almost surely, 2^1249914157 is an apocalyptic number.

It is an amenable number.

1249914157 is a deficient number, since it is larger than the sum of its proper divisors (9123599).

1249914157 is an equidigital number, since it uses as much as digits as its factorization.

1249914157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9123598.

The product of its digits is 90720, while the sum is 43.

The square root of 1249914157 is about 35354.1250351356. The cubic root of 1249914157 is about 1077.1926853665.

The spelling of 1249914157 in words is "one billion, two hundred forty-nine million, nine hundred fourteen thousand, one hundred fifty-seven".