1313251537 has 4 divisors (see below), whose sum is σ = 1414270900. Its totient is φ = 1212232176.

The previous prime is 1313251507. The next prime is 1313251549. The reversal of 1313251537 is 7351523131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 151191616 + 1162059921 = 12296^2 + 34089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313251537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313251499 and 1313251508.

It is not an unprimeable number, because it can be changed into a prime (1313251507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50509662 + ... + 50509687.

It is an arithmetic number, because the mean of its divisors is an integer number (353567725).

Almost surely, 2^1313251537 is an apocalyptic number.

It is an amenable number.

1313251537 is a deficient number, since it is larger than the sum of its proper divisors (101019363).

1313251537 is a wasteful number, since it uses less digits than its factorization.

1313251537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101019362.

The product of its digits is 9450, while the sum is 31.

The square root of 1313251537 is about 36238.8125771251. The cubic root of 1313251537 is about 1095.0887210141.

Adding to 1313251537 its reverse (7351523131), we get a palindrome (8664774668).

The spelling of 1313251537 in words is "one billion, three hundred thirteen million, two hundred fifty-one thousand, five hundred thirty-seven".