1311534025 has 12 divisors (see below), whose sum is σ = 1656988812. Its totient is φ = 1029429440.

The previous prime is 1311533963. The next prime is 1311534031. The reversal of 1311534025 is 5204351131.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 214798336 + 1096735689 = 14656^2 + 33117^2 .

It is not a de Polignac number, because 1311534025 - 2¹³ = 1311525833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 493594 + ... + 496243.

It is an arithmetic number, because the mean of its divisors is an integer number (138082401).

Almost surely, 2^1311534025 is an apocalyptic number.

It is an amenable number.

1311534025 is a deficient number, since it is larger than the sum of its proper divisors (345454787).

1311534025 is an equidigital number, since it uses as much as digits as its factorization.

1311534025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989900 (or 989895 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1311534025 is about 36215.1076900235. The cubic root of 1311534025 is about 1094.6111154937.

Adding to 1311534025 its reverse (5204351131), we get a palindrome (6515885156).

The spelling of 1311534025 in words is "one billion, three hundred eleven million, five hundred thirty-four thousand, twenty-five".