131513428 has 12 divisors (see below), whose sum is σ = 243686772. Its totient is φ = 61888640.

The previous prime is 131513423. The next prime is 131513441. The reversal of 131513428 is 824315131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 109872324 + 21641104 = 10482^2 + 4652^2 .

It is a super-2 number, since 2×131513428² = 34591563488622368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131513396 and 131513405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131513423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966943 + ... + 967078.

It is an arithmetic number, because the mean of its divisors is an integer number (20307231).

Almost surely, 2^131513428 is an apocalyptic number.

It is an amenable number.

131513428 is a deficient number, since it is larger than the sum of its proper divisors (112173344).

131513428 is a wasteful number, since it uses less digits than its factorization.

131513428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934042 (or 1934040 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 131513428 is about 11467.9304148569. The cubic root of 131513428 is about 508.5379477150.

Adding to 131513428 its reverse (824315131), we get a palindrome (955828559).

The spelling of 131513428 in words is "one hundred thirty-one million, five hundred thirteen thousand, four hundred twenty-eight".