1249610881 has 2 divisors, whose sum is σ = 1249610882. Its totient is φ = 1249610880.

The previous prime is 1249610849. The next prime is 1249610893. The reversal of 1249610881 is 1880169421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1175392656 + 74218225 = 34284^2 + 8615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249610881 - 2⁵ = 1249610849 is a prime.

It is a super-2 number, since 2×1249610881² = 3123054707827192322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1249610801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624805440 + 624805441.

It is an arithmetic number, because the mean of its divisors is an integer number (624805441).

Almost surely, 2^1249610881 is an apocalyptic number.

It is an amenable number.

1249610881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249610881 is an equidigital number, since it uses as much as digits as its factorization.

1249610881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 1249610881 is about 35349.8356573266. The cubic root of 1249610881 is about 1077.1055558857.

The spelling of 1249610881 in words is "one billion, two hundred forty-nine million, six hundred ten thousand, eight hundred eighty-one".