1291079854 has 4 divisors (see below), whose sum is σ = 1936619784. Its totient is φ = 645539926.

The previous prime is 1291079851. The next prime is 1291079863. The reversal of 1291079854 is 4589701921.

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

It is a super-2 number, since 2×1291079854² = 3333774378809322632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291079851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322769962 + ... + 322769965.

It is an arithmetic number, because the mean of its divisors is an integer number (484154946).

Almost surely, 2^1291079854 is an apocalyptic number.

1291079854 is a deficient number, since it is larger than the sum of its proper divisors (645539930).

1291079854 is an equidigital number, since it uses as much as digits as its factorization.

1291079854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645539929.

The product of its (nonzero) digits is 181440, while the sum is 46.

The square root of 1291079854 is about 35931.5996582395. The cubic root of 1291079854 is about 1088.8908994541.

The spelling of 1291079854 in words is "one billion, two hundred ninety-one million, seventy-nine thousand, eight hundred fifty-four".