1291100870 has 32 divisors (see below), whose sum is σ = 2471793408. Its totient is φ = 483867648.

The previous prime is 1291100861. The next prime is 1291100873. The reversal of 1291100870 is 780011921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291100873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20882 + ... + 54938.

It is an arithmetic number, because the mean of its divisors is an integer number (77243544).

Almost surely, 2^1291100870 is an apocalyptic number.

1291100870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1291100870 is a deficient number, since it is larger than the sum of its proper divisors (1180692538).

1291100870 is a wasteful number, since it uses less digits than its factorization.

1291100870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34304.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 1291100870 is about 35931.8921015857. The cubic root of 1291100870 is about 1088.8968076884.

The spelling of 1291100870 in words is "one billion, two hundred ninety-one million, one hundred thousand, eight hundred seventy".