1209318850971 has 128 divisors (see below), whose sum is σ = 2387630407680. Its totient is φ = 586246636800.

The previous prime is 1209318850969. The next prime is 1209318850981. The reversal of 1209318850971 is 1790588139021.

1209318850971 is a `hidden beast` number, since 1 + 20 + 9 + 31 + 88 + 509 + 7 + 1 = 666.

It is not a de Polignac number, because 1209318850971 - 2¹ = 1209318850969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1209318850981) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1652076 + ... + 2268918.

It is an arithmetic number, because the mean of its divisors is an integer number (18653362560).

Almost surely, 2^{1209318850971} is an apocalyptic number.

1209318850971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1209318850971 is a deficient number, since it is larger than the sum of its proper divisors (1178311556709).

1209318850971 is a wasteful number, since it uses less digits than its factorization.

1209318850971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616934 (or 616928 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 54.

The spelling of 1209318850971 in words is "one trillion, two hundred nine billion, three hundred eighteen million, eight hundred fifty thousand, nine hundred seventy-one".