1217051852857 has 4 divisors (see below), whose sum is σ = 1217313532816. Its totient is φ = 1216790172900.

The previous prime is 1217051852741. The next prime is 1217051852869. The reversal of 1217051852857 is 7582581507121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1217051852857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1217051856857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130833003 + ... + 130842304.

It is an arithmetic number, because the mean of its divisors is an integer number (304328383204).

Almost surely, 2^{1217051852857} is an apocalyptic number.

It is an amenable number.

1217051852857 is a deficient number, since it is larger than the sum of its proper divisors (261679959).

1217051852857 is an equidigital number, since it uses as much as digits as its factorization.

1217051852857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261679958.

The product of its (nonzero) digits is 1568000, while the sum is 52.

The spelling of 1217051852857 in words is "one trillion, two hundred seventeen billion, fifty-one million, eight hundred fifty-two thousand, eight hundred fifty-seven".