1291078870 has 16 divisors (see below), whose sum is σ = 2377987920. Its totient is φ = 504421344.

The previous prime is 1291078819. The next prime is 1291078883. The reversal of 1291078870 is 788701921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent 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, 1500825 + ... + 1501684.

It is an arithmetic number, because the mean of its divisors is an integer number (148624245).

Almost surely, 2^1291078870 is an apocalyptic number.

1291078870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1291078870 is a deficient number, since it is larger than the sum of its proper divisors (1086909050).

1291078870 is a wasteful number, since it uses less digits than its factorization.

1291078870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002559.

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 1291078870 is about 35931.5859655540. The cubic root of 1291078870 is about 1088.8906228203.

The spelling of 1291078870 in words is "one billion, two hundred ninety-one million, seventy-eight thousand, eight hundred seventy".