1681426037 has 4 divisors (see below), whose sum is σ = 1706522016. Its totient is φ = 1656330060.

The previous prime is 1681426013. The next prime is 1681426049. The reversal of 1681426037 is 7306241861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1681426037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681426057) 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, 12547889 + ... + 12548022.

It is an arithmetic number, because the mean of its divisors is an integer number (426630504).

Almost surely, 2^1681426037 is an apocalyptic number.

It is an amenable number.

1681426037 is a deficient number, since it is larger than the sum of its proper divisors (25095979).

1681426037 is an equidigital number, since it uses as much as digits as its factorization.

1681426037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25095978.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 1681426037 is about 41005.1952440176. The cubic root of 1681426037 is about 1189.1206546580.

Adding to 1681426037 its reverse (7306241861), we get a palindrome (8987667898).

The spelling of 1681426037 in words is "one billion, six hundred eighty-one million, four hundred twenty-six thousand, thirty-seven".