1291405530 has 32 divisors (see below), whose sum is σ = 3104210304. Its totient is φ = 343837376.

The previous prime is 1291405477. The next prime is 1291405543. The reversal of 1291405530 is 355041921.

1291405530 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13857 + ... + 52676.

It is an arithmetic number, because the mean of its divisors is an integer number (97006572).

Almost surely, 2^1291405530 is an apocalyptic number.

1291405530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1291405530 is an abundant number, since it is smaller than the sum of its proper divisors (1812804774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291405530 is a wasteful number, since it uses less digits than its factorization.

1291405530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67190.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1291405530 is about 35936.1312608912. The cubic root of 1291405530 is about 1088.9824496443.

The spelling of 1291405530 in words is "one billion, two hundred ninety-one million, four hundred five thousand, five hundred thirty".