1225529442 has 24 divisors (see below), whose sum is σ = 2720079180. Its totient is φ = 398545920.

The previous prime is 1225529423. The next prime is 1225529443. The reversal of 1225529442 is 2449255221.

1225529442 is a `hidden beast` number, since 12 + 2 + 552 + 94 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 977750361 + 247779081 = 31269^2 + 15741^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1225529397 and 1225529406.

It is not an unprimeable number, because it can be changed into a prime (1225529443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 829567 + ... + 831042.

Almost surely, 2^1225529442 is an apocalyptic number.

1225529442 is an abundant number, since it is smaller than the sum of its proper divisors (1494549738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225529442 is a wasteful number, since it uses less digits than its factorization.

1225529442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660658 (or 1660655 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 1225529442 is about 35007.5626400925. The cubic root of 1225529442 is about 1070.1416070191.

The spelling of 1225529442 in words is "one billion, two hundred twenty-five million, five hundred twenty-nine thousand, four hundred forty-two".