1634618081 has 2 divisors, whose sum is σ = 1634618082. Its totient is φ = 1634618080.

The previous prime is 1634618057. The next prime is 1634618087. The reversal of 1634618081 is 1808164361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1630140625 + 4477456 = 40375^2 + 2116^2 .

It is an emirp because it is prime and its reverse (1808164361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1634618081 - 2¹⁸ = 1634355937 is a prime.

It is a super-2 number, since 2×1634618081² = 5343952541464245122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1634618087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 817309040 + 817309041.

It is an arithmetic number, because the mean of its divisors is an integer number (817309041).

Almost surely, 2^1634618081 is an apocalyptic number.

It is an amenable number.

1634618081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1634618081 is an equidigital number, since it uses as much as digits as its factorization.

1634618081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 1634618081 is about 40430.4103491419. The cubic root of 1634618081 is about 1177.9823033422.

The spelling of 1634618081 in words is "one billion, six hundred thirty-four million, six hundred eighteen thousand, eighty-one".