1249551898 has 16 divisors (see below), whose sum is σ = 2157503040. Its totient is φ = 531668736.

The previous prime is 1249551893. The next prime is 1249551899. The reversal of 1249551898 is 8981559421.

It is a happy number.

It is a super-2 number, since 2×1249551898² = 3122759891590804808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1249551893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319111 + ... + 323002.

It is an arithmetic number, because the mean of its divisors is an integer number (134843940).

Almost surely, 2^1249551898 is an apocalyptic number.

1249551898 is a deficient number, since it is larger than the sum of its proper divisors (907951142).

1249551898 is a wasteful number, since it uses less digits than its factorization.

1249551898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642261.

The product of its digits is 1036800, while the sum is 52.

The square root of 1249551898 is about 35349.0013720331. The cubic root of 1249551898 is about 1077.0886087657.

The spelling of 1249551898 in words is "one billion, two hundred forty-nine million, five hundred fifty-one thousand, eight hundred ninety-eight".