1291250530 has 8 divisors (see below), whose sum is σ = 2324250972. Its totient is φ = 516500208.

The previous prime is 1291250473. The next prime is 1291250557. The reversal of 1291250530 is 350521921.

It can be written as a sum of positive squares in 2 ways, for example, as 1285437609 + 5812921 = 35853^2 + 2411^2 .

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

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, 64562517 + ... + 64562536.

Almost surely, 2^1291250530 is an apocalyptic number.

1291250530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1291250530 is a deficient number, since it is larger than the sum of its proper divisors (1033000442).

1291250530 is a wasteful number, since it uses less digits than its factorization.

1291250530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129125060.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 1291250530 is about 35933.9745922991. The cubic root of 1291250530 is about 1088.9388797949.

The spelling of 1291250530 in words is "one billion, two hundred ninety-one million, two hundred fifty thousand, five hundred thirty".