1716837421 has 4 divisors (see below), whose sum is σ = 1848901852. Its totient is φ = 1584772992.

The previous prime is 1716837391. The next prime is 1716837431. The reversal of 1716837421 is 1247386171.

It is a happy number.

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 566678025 + 1150159396 = 23805^2 + 33914^2 .

It is a cyclic number.

It is not a de Polignac number, because 1716837421 - 2¹³ = 1716829229 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 (1716837431) 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, 66032196 + ... + 66032221.

It is an arithmetic number, because the mean of its divisors is an integer number (462225463).

Almost surely, 2^1716837421 is an apocalyptic number.

It is an amenable number.

1716837421 is a deficient number, since it is larger than the sum of its proper divisors (132064431).

1716837421 is a wasteful number, since it uses less digits than its factorization.

1716837421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132064430.

The product of its digits is 56448, while the sum is 40.

The square root of 1716837421 is about 41434.7368882680. The cubic root of 1716837421 is about 1197.4104857085.

The spelling of 1716837421 in words is "one billion, seven hundred sixteen million, eight hundred thirty-seven thousand, four hundred twenty-one".