1520343131 has 4 divisors (see below), whose sum is σ = 1555699992. Its totient is φ = 1484986272.

The previous prime is 1520343119. The next prime is 1520343173. The reversal of 1520343131 is 1313430251.

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

It is a cyclic number.

It is not a de Polignac number, because 1520343131 - 2¹⁸ = 1520080987 is a prime.

It is a super-2 number, since 2×1520343131² = 4622886471957766322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1520343097 and 1520343106.

It is not an unprimeable number, because it can be changed into a prime (1520343731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17678366 + ... + 17678451.

It is an arithmetic number, because the mean of its divisors is an integer number (388924998).

Almost surely, 2^1520343131 is an apocalyptic number.

1520343131 is a deficient number, since it is larger than the sum of its proper divisors (35356861).

1520343131 is an equidigital number, since it uses as much as digits as its factorization.

1520343131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35356860.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1520343131 is about 38991.5776931378. The cubic root of 1520343131 is about 1149.8659279112.

Adding to 1520343131 its reverse (1313430251), we get a palindrome (2833773382).

The spelling of 1520343131 in words is "one billion, five hundred twenty million, three hundred forty-three thousand, one hundred thirty-one".