1809672101 has 2 divisors, whose sum is σ = 1809672102. Its totient is φ = 1809672100.

The previous prime is 1809672091. The next prime is 1809672103. The reversal of 1809672101 is 1012769081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1573312225 + 236359876 = 39665^2 + 15374^2 .

It is an emirp because it is prime and its reverse (1012769081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1809672101 - 2²² = 1805477797 is a prime.

It is a super-3 number, since 3×1809672101³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 1809672103, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1809672103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904836050 + 904836051.

It is an arithmetic number, because the mean of its divisors is an integer number (904836051).

Almost surely, 2^1809672101 is an apocalyptic number.

It is an amenable number.

1809672101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1809672101 is an equidigital number, since it uses as much as digits as its factorization.

1809672101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 1809672101 is about 42540.2409607656. The cubic root of 1809672101 is about 1218.6153108714.

The spelling of 1809672101 in words is "one billion, eight hundred nine million, six hundred seventy-two thousand, one hundred one".