1287311290 has 16 divisors (see below), whose sum is σ = 2321242920. Its totient is φ = 514017280.

The previous prime is 1287311269. The next prime is 1287311293. The reversal of 1287311290 is 921137821.

It can be written as a sum of positive squares in 4 ways, for example, as 978500961 + 308810329 = 31281^2 + 17573^2 .

It is a super-2 number, since 2×1287311290² = 3314340714722928200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1287311293) 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 7 ways as a sum of consecutive naturals, for example, 107431 + ... + 118810.

Almost surely, 2^1287311290 is an apocalyptic number.

1287311290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1287311290 is a deficient number, since it is larger than the sum of its proper divisors (1033931630).

1287311290 is a wasteful number, since it uses less digits than its factorization.

1287311290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226817.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 1287311290 is about 35879.1205299127. The cubic root of 1287311290 is about 1087.8304036804.

The spelling of 1287311290 in words is "one billion, two hundred eighty-seven million, three hundred eleven thousand, two hundred ninety".