1345520231 has 8 divisors (see below), whose sum is σ = 1469633664. Its totient is φ = 1221705720.

The previous prime is 1345520227. The next prime is 1345520237. The reversal of 1345520231 is 1320255431.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1345520231 - 2² = 1345520227 is a prime.

It is a super-2 number, since 2×1345520231² = 3620849384060586722, 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 1345520231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345520237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65261 + ... + 83366.

It is an arithmetic number, because the mean of its divisors is an integer number (183704208).

Almost surely, 2^1345520231 is an apocalyptic number.

1345520231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1345520231 is a deficient number, since it is larger than the sum of its proper divisors (124113433).

1345520231 is a wasteful number, since it uses less digits than its factorization.

1345520231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149461.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1345520231 is about 36681.3335499134. Note that the first 3 decimals coincide. The cubic root of 1345520231 is about 1103.9856052414.

Adding to 1345520231 its reverse (1320255431), we get a palindrome (2665775662).

The spelling of 1345520231 in words is "one billion, three hundred forty-five million, five hundred twenty thousand, two hundred thirty-one".