1291225490 has 8 divisors (see below), whose sum is σ = 2324205900. Its totient is φ = 516490192.

The previous prime is 1291225477. The next prime is 1291225549. The reversal of 1291225490 is 945221921.

It can be written as a sum of positive squares in 2 ways, for example, as 1247573041 + 43652449 = 35321^2 + 6607^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1291225490.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64561265 + ... + 64561284.

Almost surely, 2^1291225490 is an apocalyptic number.

1291225490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1291225490 is a deficient number, since it is larger than the sum of its proper divisors (1032980410).

1291225490 is a wasteful number, since it uses less digits than its factorization.

1291225490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129122556.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 1291225490 is about 35933.6261738222. The cubic root of 1291225490 is about 1088.9318408289.

The spelling of 1291225490 in words is "one billion, two hundred ninety-one million, two hundred twenty-five thousand, four hundred ninety".