1211226413 has 4 divisors (see below), whose sum is σ = 1243962300. Its totient is φ = 1178490528.

The previous prime is 1211226407. The next prime is 1211226449. The reversal of 1211226413 is 3146221121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3146221121 = 11119 ⋅282959.

It can be written as a sum of positive squares in 2 ways, for example, as 895026889 + 316199524 = 29917^2 + 17782^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211226413 - 2⁴ = 1211226397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211226403) 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, 16367888 + ... + 16367961.

It is an arithmetic number, because the mean of its divisors is an integer number (310990575).

Almost surely, 2^1211226413 is an apocalyptic number.

It is an amenable number.

1211226413 is a deficient number, since it is larger than the sum of its proper divisors (32735887).

1211226413 is an equidigital number, since it uses as much as digits as its factorization.

1211226413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32735886.

The product of its digits is 576, while the sum is 23.

The square root of 1211226413 is about 34802.6782446409. The cubic root of 1211226413 is about 1065.9621340538.

Adding to 1211226413 its reverse (3146221121), we get a palindrome (4357447534).

The spelling of 1211226413 in words is "one billion, two hundred eleven million, two hundred twenty-six thousand, four hundred thirteen".