1249580989 has 16 divisors (see below), whose sum is σ = 1303853760. Its totient is φ = 1196697600.

The previous prime is 1249580987. The next prime is 1249581049. The reversal of 1249580989 is 9890859421.

It is a cyclic number.

It is not a de Polignac number, because 1249580989 - 2¹ = 1249580987 is a prime.

It is a super-2 number, since 2×1249580989² = 3122905296140436242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249580987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 463357 + ... + 466045.

It is an arithmetic number, because the mean of its divisors is an integer number (81490860).

Almost surely, 2^1249580989 is an apocalyptic number.

It is an amenable number.

1249580989 is a deficient number, since it is larger than the sum of its proper divisors (54272771).

1249580989 is a wasteful number, since it uses less digits than its factorization.

1249580989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940.

The product of its (nonzero) digits is 1866240, while the sum is 55.

The square root of 1249580989 is about 35349.4128522667. The cubic root of 1249580989 is about 1077.0969673199.

The spelling of 1249580989 in words is "one billion, two hundred forty-nine million, five hundred eighty thousand, nine hundred eighty-nine".