1225412145 has 20 divisors (see below), whose sum is σ = 2196665460. Its totient is φ = 653552928.

The previous prime is 1225412129. The next prime is 1225412171. The reversal of 1225412145 is 5412145221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 333135504 + 892276641 = 18252^2 + 29871^2 .

It is not a de Polignac number, because 1225412145 - 2⁴ = 1225412129 is a prime.

It is a super-2 number, since 2×1225412145² = 3003269850227002050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1512450 + ... + 1513259.

It is an arithmetic number, because the mean of its divisors is an integer number (109833273).

Almost surely, 2^1225412145 is an apocalyptic number.

1225412145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1225412145 is a deficient number, since it is larger than the sum of its proper divisors (971253315).

1225412145 is an equidigital number, since it uses as much as digits as its factorization.

1225412145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3025726 (or 3025717 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 1225412145 is about 35005.8872905687. The cubic root of 1225412145 is about 1070.1074643863.

Adding to 1225412145 its reverse (5412145221), we get a palindrome (6637557366).

It can be divided in two parts, 12254121 and 45, that multiplied together give a triangular number (551435445 = T₃₃₂₀₉).

The spelling of 1225412145 in words is "one billion, two hundred twenty-five million, four hundred twelve thousand, one hundred forty-five".