1513531 has 2 divisors, whose sum is σ = 1513532. Its totient is φ = 1513530.

The previous prime is 1513529. The next prime is 1513537. The reversal of 1513531 is 1353151.

1513531 = T₁₀₀₃ + T₁₀₀₄ + T₁₀₀₅.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1513531 - 2¹ = 1513529 is a prime.

It is a super-2 number, since 2×1513531² = 4581552175922, which contains 22 as substring.

Together with 1513529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1513499 and 1513508.

It is not a weakly prime, because it can be changed into another prime (1513537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 756765 + 756766.

It is an arithmetic number, because the mean of its divisors is an integer number (756766).

2^1513531 is an apocalyptic number.

1513531 is the 1005-th centered triangular number.

1513531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1513531 is an equidigital number, since it uses as much as digits as its factorization.

1513531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225, while the sum is 19.

The square root of 1513531 is about 1230.2564773250. The cubic root of 1513531 is about 114.8145972851.

Adding to 1513531 its reverse (1353151), we get a palindrome (2866682).

The spelling of 1513531 in words is "one million, five hundred thirteen thousand, five hundred thirty-one".