1249157867 has 2 divisors, whose sum is σ = 1249157868. Its totient is φ = 1249157866.

The previous prime is 1249157827. The next prime is 1249157873. The reversal of 1249157867 is 7687519421.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1249157867 - 2¹² = 1249153771 is a prime.

It is not a weakly prime, because it can be changed into another prime (1249157827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624578933 + 624578934.

It is an arithmetic number, because the mean of its divisors is an integer number (624578934).

Almost surely, 2^1249157867 is an apocalyptic number.

1249157867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249157867 is an equidigital number, since it uses as much as digits as its factorization.

1249157867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 50.

The square root of 1249157867 is about 35343.4274936656. The cubic root of 1249157867 is about 1076.9753812638.

The spelling of 1249157867 in words is "one billion, two hundred forty-nine million, one hundred fifty-seven thousand, eight hundred sixty-seven".