1634213261 has 2 divisors, whose sum is σ = 1634213262. Its totient is φ = 1634213260.

The previous prime is 1634213233. The next prime is 1634213279. The reversal of 1634213261 is 1623124361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1045228900 + 588984361 = 32330^2 + 24269^2 .

It is a cyclic number.

It is not a de Polignac number, because 1634213261 - 2³⁰ = 560471437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1634213221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 817106630 + 817106631.

It is an arithmetic number, because the mean of its divisors is an integer number (817106631).

Almost surely, 2^1634213261 is an apocalyptic number.

It is an amenable number.

1634213261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1634213261 is an equidigital number, since it uses as much as digits as its factorization.

1634213261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 1634213261 is about 40425.4036590855. The cubic root of 1634213261 is about 1177.8850512331.

Subtracting from 1634213261 its reverse (1623124361), we obtain a square (11088900 = 3330²).

The spelling of 1634213261 in words is "one billion, six hundred thirty-four million, two hundred thirteen thousand, two hundred sixty-one".