1631256343 has 4 divisors (see below), whose sum is σ = 1717111960. Its totient is φ = 1545400728.

The previous prime is 1631256331. The next prime is 1631256383. The reversal of 1631256343 is 3436521361.

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 1631256343 - 2⁹ = 1631255831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1631256299 and 1631256308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631256383) 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, 42927780 + ... + 42927817.

It is an arithmetic number, because the mean of its divisors is an integer number (429277990).

Almost surely, 2^1631256343 is an apocalyptic number.

1631256343 is a deficient number, since it is larger than the sum of its proper divisors (85855617).

1631256343 is an equidigital number, since it uses as much as digits as its factorization.

1631256343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85855616.

The product of its digits is 38880, while the sum is 34.

The square root of 1631256343 is about 40388.8145778011. The cubic root of 1631256343 is about 1177.1742071944.

The spelling of 1631256343 in words is "one billion, six hundred thirty-one million, two hundred fifty-six thousand, three hundred forty-three".