1225431145 has 24 divisors (see below), whose sum is σ = 1627717896. Its totient is φ = 882528768.

The previous prime is 1225431143. The next prime is 1225431169. The reversal of 1225431145 is 5411345221.

It can be written as a sum of positive squares in 4 ways, for example, as 258469929 + 966961216 = 16077^2 + 31096^2 .

It is not a de Polignac number, because 1225431145 - 2¹ = 1225431143 is a prime.

It is a super-2 number, since 2×1225431145² = 3003362982272022050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225431143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31339 + ... + 58591.

It is an arithmetic number, because the mean of its divisors is an integer number (67821579).

Almost surely, 2^1225431145 is an apocalyptic number.

It is an amenable number.

1225431145 is a deficient number, since it is larger than the sum of its proper divisors (402286751).

1225431145 is a wasteful number, since it uses less digits than its factorization.

1225431145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27321 (or 27298 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 1225431145 is about 35006.1586724393. The cubic root of 1225431145 is about 1070.1129950254.

Adding to 1225431145 its reverse (5411345221), we get a palindrome (6636776366).

The spelling of 1225431145 in words is "one billion, two hundred twenty-five million, four hundred thirty-one thousand, one hundred forty-five".