1345520431 has 4 divisors (see below), whose sum is σ = 1345914000. Its totient is φ = 1345126864.

The previous prime is 1345520419. The next prime is 1345520461. The reversal of 1345520431 is 1340255431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1340255431 = 47 ⋅28516073.

It is a cyclic number.

It is not a de Polignac number, because 1345520431 - 2⁷ = 1345520303 is a prime.

It is a super-2 number, since 2×1345520431² = 3620850460476851522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1345520431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345520461) 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, 191611 + ... + 198508.

It is an arithmetic number, because the mean of its divisors is an integer number (336478500).

Almost surely, 2^1345520431 is an apocalyptic number.

1345520431 is a deficient number, since it is larger than the sum of its proper divisors (393569).

1345520431 is an equidigital number, since it uses as much as digits as its factorization.

1345520431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393568.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1345520431 is about 36681.3362760955. The cubic root of 1345520431 is about 1103.9856599407.

Adding to 1345520431 its reverse (1340255431), we get a palindrome (2685775862).

The spelling of 1345520431 in words is "one billion, three hundred forty-five million, five hundred twenty thousand, four hundred thirty-one".