1634253261 has 4 divisors (see below), whose sum is σ = 2179004352. Its totient is φ = 1089502172.

The previous prime is 1634253253. The next prime is 1634253277. The reversal of 1634253261 is 1623524361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1634253261 - 2³ = 1634253253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1634213261) 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, 272375541 + ... + 272375546.

It is an arithmetic number, because the mean of its divisors is an integer number (544751088).

Almost surely, 2^1634253261 is an apocalyptic number.

It is an amenable number.

1634253261 is a deficient number, since it is larger than the sum of its proper divisors (544751091).

1634253261 is an equidigital number, since it uses as much as digits as its factorization.

1634253261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544751090.

The product of its digits is 25920, while the sum is 33.

The square root of 1634253261 is about 40425.8983944699. The cubic root of 1634253261 is about 1177.8946613655.

The spelling of 1634253261 in words is "one billion, six hundred thirty-four million, two hundred fifty-three thousand, two hundred sixty-one".