1291560355 has 4 divisors (see below), whose sum is σ = 1549872432. Its totient is φ = 1033248280.

The previous prime is 1291560349. The next prime is 1291560367. The reversal of 1291560355 is 5530651921.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1291560355 - 2¹⁹ = 1291036067 is a prime.

It is a Duffinian number.

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, 129156031 + ... + 129156040.

It is an arithmetic number, because the mean of its divisors is an integer number (387468108).

Almost surely, 2^1291560355 is an apocalyptic number.

1291560355 is a deficient number, since it is larger than the sum of its proper divisors (258312077).

1291560355 is an equidigital number, since it uses as much as digits as its factorization.

1291560355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258312076.

The product of its (nonzero) digits is 40500, while the sum is 37.

The square root of 1291560355 is about 35938.2853653315. The cubic root of 1291560355 is about 1089.0259668216.

The spelling of 1291560355 in words is "one billion, two hundred ninety-one million, five hundred sixty thousand, three hundred fifty-five".