1225694837 has 4 divisors (see below), whose sum is σ = 1225772556. Its totient is φ = 1225617120.

The previous prime is 1225694809. The next prime is 1225694839. The reversal of 1225694837 is 7384965221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7384965221 = 4139 ⋅1784239.

It can be written as a sum of positive squares in 2 ways, for example, as 1092038116 + 133656721 = 33046^2 + 11561^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225694837 - 2²⁴ = 1208917621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225694791 and 1225694800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225694839) 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, 5864 + ... + 49857.

It is an arithmetic number, because the mean of its divisors is an integer number (306443139).

Almost surely, 2^1225694837 is an apocalyptic number.

It is an amenable number.

1225694837 is a deficient number, since it is larger than the sum of its proper divisors (77719).

1225694837 is an equidigital number, since it uses as much as digits as its factorization.

1225694837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77718.

The product of its digits is 725760, while the sum is 47.

The square root of 1225694837 is about 35009.9248356805. The cubic root of 1225694837 is about 1070.1897462432.

The spelling of 1225694837 in words is "one billion, two hundred twenty-five million, six hundred ninety-four thousand, eight hundred thirty-seven".