1291611455 has 4 divisors (see below), whose sum is σ = 1549933752. Its totient is φ = 1033289160.

The previous prime is 1291611443. The next prime is 1291611467. The reversal of 1291611455 is 5541161921.

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

It is an interprime number because it is at equal distance from previous prime (1291611443) and next prime (1291611467).

It is not a de Polignac number, because 1291611455 - 2²² = 1287417151 is a prime.

It is a Duffinian number.

It is a congruent 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, 129161141 + ... + 129161150.

It is an arithmetic number, because the mean of its divisors is an integer number (387483438).

Almost surely, 2^1291611455 is an apocalyptic number.

1291611455 is a deficient number, since it is larger than the sum of its proper divisors (258322297).

1291611455 is an equidigital number, since it uses as much as digits as its factorization.

1291611455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258322296.

The product of its digits is 10800, while the sum is 35.

The square root of 1291611455 is about 35938.9962992847. The cubic root of 1291611455 is about 1089.0403289051.

The spelling of 1291611455 in words is "one billion, two hundred ninety-one million, six hundred eleven thousand, four hundred fifty-five".