1225437291 has 24 divisors (see below), whose sum is σ = 1910563200. Its totient is φ = 752403456.

The previous prime is 1225437289. The next prime is 1225437307. The reversal of 1225437291 is 1927345221.

1225437291 is a `hidden beast` number, since 1 + 22 + 543 + 7 + 2 + 91 = 666.

It is not a de Polignac number, because 1225437291 - 2¹ = 1225437289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225437391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40870 + ... + 64196.

It is an arithmetic number, because the mean of its divisors is an integer number (79606800).

Almost surely, 2^1225437291 is an apocalyptic number.

1225437291 is a deficient number, since it is larger than the sum of its proper divisors (685125909).

1225437291 is a wasteful number, since it uses less digits than its factorization.

1225437291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23795 (or 23792 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 1225437291 is about 35006.2464568825. The cubic root of 1225437291 is about 1070.1147840293.

It can be divided in two parts, 1225 and 437291, that added together give a triangular number (438516 = T₉₃₆).

The spelling of 1225437291 in words is "one billion, two hundred twenty-five million, four hundred thirty-seven thousand, two hundred ninety-one".