1213515320251 has 4 divisors (see below), whose sum is σ = 1306862652592. Its totient is φ = 1120167987912.

The previous prime is 1213515320207. The next prime is 1213515320267. The reversal of 1213515320251 is 1520235153121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213515320251 - 2²⁷ = 1213381102523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213515320851) 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, 46673666151 + ... + 46673666176.

It is an arithmetic number, because the mean of its divisors is an integer number (326715663148).

Almost surely, 2^{1213515320251} is an apocalyptic number.

1213515320251 is a deficient number, since it is larger than the sum of its proper divisors (93347332341).

1213515320251 is an equidigital number, since it uses as much as digits as its factorization.

1213515320251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93347332340.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 1213515320251 in words is "one trillion, two hundred thirteen billion, five hundred fifteen million, three hundred twenty thousand, two hundred fifty-one".