1291081465 has 8 divisors (see below), whose sum is σ = 1555190208. Its totient is φ = 1028936880.

The previous prime is 1291081453. The next prime is 1291081487. The reversal of 1291081465 is 5641801921.

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

It is not a de Polignac number, because 1291081465 - 2⁵ = 1291081433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489591 + ... + 492220.

It is an arithmetic number, because the mean of its divisors is an integer number (194398776).

Almost surely, 2^1291081465 is an apocalyptic number.

It is an amenable number.

1291081465 is a deficient number, since it is larger than the sum of its proper divisors (264108743).

1291081465 is an equidigital number, since it uses as much as digits as its factorization.

1291081465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982079.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 1291081465 is about 35931.6220758262. The cubic root of 1291081465 is about 1088.8913523573.

The spelling of 1291081465 in words is "one billion, two hundred ninety-one million, eighty-one thousand, four hundred sixty-five".