1305520131 has 4 divisors (see below), whose sum is σ = 1740693512. Its totient is φ = 870346752.

The previous prime is 1305520127. The next prime is 1305520147. The reversal of 1305520131 is 1310255031.

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

It is not a de Polignac number, because 1305520131 - 2² = 1305520127 is a prime.

It is a super-2 number, since 2×1305520131² = 3408765624892514322, 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 = 1305520098 and 1305520107.

It is not an unprimeable number, because it can be changed into a prime (1305520121) 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, 217586686 + ... + 217586691.

It is an arithmetic number, because the mean of its divisors is an integer number (435173378).

Almost surely, 2^1305520131 is an apocalyptic number.

1305520131 is a deficient number, since it is larger than the sum of its proper divisors (435173381).

1305520131 is an equidigital number, since it uses as much as digits as its factorization.

1305520131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435173380.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1305520131 is about 36131.9821072689. The cubic root of 1305520131 is about 1092.9354790542.

Adding to 1305520131 its reverse (1310255031), we get a palindrome (2615775162).

The spelling of 1305520131 in words is "one billion, three hundred five million, five hundred twenty thousand, one hundred thirty-one".