1340312251 has 4 divisors (see below), whose sum is σ = 1341574192. Its totient is φ = 1339050312.

The previous prime is 1340312243. The next prime is 1340312257. The reversal of 1340312251 is 1522130431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1522130431 = 223 ⋅6825697.

It is a cyclic number.

It is not a de Polignac number, because 1340312251 - 2³ = 1340312243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340312257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629376 + ... + 631501.

It is an arithmetic number, because the mean of its divisors is an integer number (335393548).

Almost surely, 2^1340312251 is an apocalyptic number.

1340312251 is a deficient number, since it is larger than the sum of its proper divisors (1261941).

1340312251 is a wasteful number, since it uses less digits than its factorization.

1340312251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261940.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1340312251 is about 36610.2752106564. The cubic root of 1340312251 is about 1102.5593987636.

Adding to 1340312251 its reverse (1522130431), we get a palindrome (2862442682).

The spelling of 1340312251 in words is "one billion, three hundred forty million, three hundred twelve thousand, two hundred fifty-one".