1213255788251 has 8 divisors (see below), whose sum is σ = 1311667141344. Its totient is φ = 1115570718720.

The previous prime is 1213255788169. The next prime is 1213255788263. The reversal of 1213255788251 is 1528875523121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213255788251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213255788251.

It is not an unprimeable number, because it can be changed into a prime (1213255188251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181567415 + ... + 181574096.

It is an arithmetic number, because the mean of its divisors is an integer number (163958392668).

Almost surely, 2^{1213255788251} is an apocalyptic number.

1213255788251 is a deficient number, since it is larger than the sum of its proper divisors (98411353093).

1213255788251 is a wasteful number, since it uses less digits than its factorization.

1213255788251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363141781.

The product of its digits is 1344000, while the sum is 50.

The spelling of 1213255788251 in words is "one trillion, two hundred thirteen billion, two hundred fifty-five million, seven hundred eighty-eight thousand, two hundred fifty-one".