1222513637 has 4 divisors (see below), whose sum is σ = 1286856480. Its totient is φ = 1158170796.

The previous prime is 1222513631. The next prime is 1222513651. The reversal of 1222513637 is 7363152221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7363152221 = 149 ⋅49417129.

It is a cyclic number.

It is not a de Polignac number, because 1222513637 - 2²⁰ = 1221465061 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 (1222513631) 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, 32171393 + ... + 32171430.

It is an arithmetic number, because the mean of its divisors is an integer number (321714120).

Almost surely, 2^1222513637 is an apocalyptic number.

It is an amenable number.

1222513637 is a deficient number, since it is larger than the sum of its proper divisors (64342843).

1222513637 is an equidigital number, since it uses as much as digits as its factorization.

1222513637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64342842.

The product of its digits is 15120, while the sum is 32.

The square root of 1222513637 is about 34964.4624869309. The cubic root of 1222513637 is about 1069.2630780554.

Adding to 1222513637 its reverse (7363152221), we get a palindrome (8585665858).

The spelling of 1222513637 in words is "one billion, two hundred twenty-two million, five hundred thirteen thousand, six hundred thirty-seven".