1305531225 has 72 divisors (see below), whose sum is σ = 2415204792. Its totient is φ = 673689600.

The previous prime is 1305531223. The next prime is 1305531257. The reversal of 1305531225 is 5221355031.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 271458576 + 1034072649 = 16476^2 + 32157^2 .

It is not a de Polignac number, because 1305531225 - 2¹ = 1305531223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1305531223) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1263309 + ... + 1264341.

It is an arithmetic number, because the mean of its divisors is an integer number (33544511).

Almost surely, 2^1305531225 is an apocalyptic number.

1305531225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1305531225 is a deficient number, since it is larger than the sum of its proper divisors (1109673567).

1305531225 is a wasteful number, since it uses less digits than its factorization.

1305531225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227 (or 1219 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 1305531225 is about 36132.1356274439. The cubic root of 1305531225 is about 1092.9385748808.

Adding to 1305531225 its reverse (5221355031), we get a palindrome (6526886256).

It can be divided in two parts, 130 and 5531225, that added together give a palindrome (5531355).

The spelling of 1305531225 in words is "one billion, three hundred five million, five hundred thirty-one thousand, two hundred twenty-five".