1249551899 has 2 divisors, whose sum is σ = 1249551900. Its totient is φ = 1249551898.

The previous prime is 1249551893. The next prime is 1249551907. The reversal of 1249551899 is 9981559421.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1249551899 is a prime.

It is a super-2 number, since 2×1249551899² = 3122759896589012402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1249551899.

It is not a weakly prime, because it can be changed into another prime (1249551893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624775949 + 624775950.

It is an arithmetic number, because the mean of its divisors is an integer number (624775950).

Almost surely, 2^1249551899 is an apocalyptic number.

1249551899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249551899 is an equidigital number, since it uses as much as digits as its factorization.

1249551899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 53.

The square root of 1249551899 is about 35349.0013861778. The cubic root of 1249551899 is about 1077.0886090531.

The spelling of 1249551899 in words is "one billion, two hundred forty-nine million, five hundred fifty-one thousand, eight hundred ninety-nine".