1213606051 has 4 divisors (see below), whose sum is σ = 1386978352. Its totient is φ = 1040233752.

The previous prime is 1213606039. The next prime is 1213606061. The reversal of 1213606051 is 1506063121.

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 1213606051 - 2⁷ = 1213605923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213606061) 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, 86686140 + ... + 86686153.

It is an arithmetic number, because the mean of its divisors is an integer number (346744588).

Almost surely, 2^1213606051 is an apocalyptic number.

1213606051 is a deficient number, since it is larger than the sum of its proper divisors (173372301).

1213606051 is an equidigital number, since it uses as much as digits as its factorization.

1213606051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173372300.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1213606051 is about 34836.8490394869. The cubic root of 1213606051 is about 1066.6597588203.

Adding to 1213606051 its reverse (1506063121), we get a palindrome (2719669172).

The spelling of 1213606051 in words is "one billion, two hundred thirteen million, six hundred six thousand, fifty-one".