1231545225 has 24 divisors (see below), whose sum is σ = 2037940000. Its totient is φ = 656248320.

The previous prime is 1231545223. The next prime is 1231545253. The reversal of 1231545225 is 5225451321.

It is not a de Polignac number, because 1231545225 - 2¹ = 1231545223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231545192 and 1231545201.

It is not an unprimeable number, because it can be changed into a prime (1231545223) 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, 87102 + ... + 100248.

Almost surely, 2^1231545225 is an apocalyptic number.

1231545225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231545225 is a deficient number, since it is larger than the sum of its proper divisors (806394775).

1231545225 is a wasteful number, since it uses less digits than its factorization.

1231545225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14409 (or 14404 counting only the distinct ones).

The product of its digits is 12000, while the sum is 30.

The square root of 1231545225 is about 35093.3786489702. The cubic root of 1231545225 is about 1071.8897588541.

Adding to 1231545225 its reverse (5225451321), we get a palindrome (6456996546).

The spelling of 1231545225 in words is "one billion, two hundred thirty-one million, five hundred forty-five thousand, two hundred twenty-five".