1313230725 has 30 divisors (see below), whose sum is σ = 2432561010. Its totient is φ = 700388640.

The previous prime is 1313230703. The next prime is 1313230729. The reversal of 1313230725 is 5270323131.

It can be written as a sum of positive squares in 3 ways, for example, as 438609249 + 874621476 = 20943^2 + 29574^2 .

It is not a de Polignac number, because 1313230725 - 2¹⁴ = 1313214341 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313230729) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 322230 + ... + 326279.

It is an arithmetic number, because the mean of its divisors is an integer number (81085367).

Almost surely, 2^1313230725 is an apocalyptic number.

1313230725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1313230725 is a deficient number, since it is larger than the sum of its proper divisors (1119330285).

1313230725 is an equidigital number, since it uses as much as digits as its factorization.

1313230725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648531 (or 648517 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 1313230725 is about 36238.5254252984. The cubic root of 1313230725 is about 1095.0829361089.

Adding to 1313230725 its reverse (5270323131), we get a palindrome (6583553856).

The spelling of 1313230725 in words is "one billion, three hundred thirteen million, two hundred thirty thousand, seven hundred twenty-five".