1295551291 has 4 divisors (see below), whose sum is σ = 1351879632. Its totient is φ = 1239222952.

The previous prime is 1295551289. The next prime is 1295551297. The reversal of 1295551291 is 1921555921.

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

It is a cyclic number.

It is not a de Polignac number, because 1295551291 - 2¹ = 1295551289 is a prime.

It is a super-2 number, since 2×1295551291² = 3356906295223533362, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1295551297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28164136 + ... + 28164181.

It is an arithmetic number, because the mean of its divisors is an integer number (337969908).

Almost surely, 2^1295551291 is an apocalyptic number.

1295551291 is a deficient number, since it is larger than the sum of its proper divisors (56328341).

1295551291 is an equidigital number, since it uses as much as digits as its factorization.

1295551291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56328340.

The product of its digits is 40500, while the sum is 40.

The square root of 1295551291 is about 35993.7673910359. The cubic root of 1295551291 is about 1090.1465142669.

It can be divided in two parts, 12955 and 51291, that added together give a palindrome (64246).

The spelling of 1295551291 in words is "one billion, two hundred ninety-five million, five hundred fifty-one thousand, two hundred ninety-one".