1681426601 has 4 divisors (see below), whose sum is σ = 1682652612. Its totient is φ = 1680200592.

The previous prime is 1681426597. The next prime is 1681426609. The reversal of 1681426601 is 1066241861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 757570576 + 923856025 = 27524^2 + 30395^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681426601 - 2² = 1681426597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (1681426609) 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, 610946 + ... + 613691.

It is an arithmetic number, because the mean of its divisors is an integer number (420663153).

Almost surely, 2^1681426601 is an apocalyptic number.

It is an amenable number.

1681426601 is a deficient number, since it is larger than the sum of its proper divisors (1226011).

1681426601 is a wasteful number, since it uses less digits than its factorization.

1681426601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226010.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1681426601 is about 41005.2021211943. The cubic root of 1681426601 is about 1189.1207876134.

The spelling of 1681426601 in words is "one billion, six hundred eighty-one million, four hundred twenty-six thousand, six hundred one".