1291088278 has 32 divisors (see below), whose sum is σ = 2009901600. Its totient is φ = 621600000.

The previous prime is 1291088269. The next prime is 1291088299. The reversal of 1291088278 is 8728801921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3066508 + ... + 3066928.

It is an arithmetic number, because the mean of its divisors is an integer number (62809425).

Almost surely, 2^1291088278 is an apocalyptic number.

1291088278 is a deficient number, since it is larger than the sum of its proper divisors (718813322).

1291088278 is a wasteful number, since it uses less digits than its factorization.

1291088278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864.

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 1291088278 is about 35931.7168807726. The cubic root of 1291088278 is about 1088.8932677034.

The spelling of 1291088278 in words is "one billion, two hundred ninety-one million, eighty-eight thousand, two hundred seventy-eight".