634109881 has 8 divisors (see below), whose sum is σ = 636877640. Its totient is φ = 631348992.

The previous prime is 634109851. The next prime is 634109897. The reversal of 634109881 is 188901436.

It can be written as a sum of positive squares in 4 ways, for example, as 69572281 + 564537600 = 8341^2 + 23760^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 634109881 - 2⁵ = 634109849 is a prime.

It is a super-2 number, since 2×634109881² = 804190682363668322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634109821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264235 + ... + 266623.

It is an arithmetic number, because the mean of its divisors is an integer number (79609705).

Almost surely, 2^634109881 is an apocalyptic number.

It is an amenable number.

634109881 is a deficient number, since it is larger than the sum of its proper divisors (2767759).

634109881 is a wasteful number, since it uses less digits than its factorization.

634109881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3435.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 634109881 is about 25181.5384954931. The cubic root of 634109881 is about 859.1219996370.

The spelling of 634109881 in words is "six hundred thirty-four million, one hundred nine thousand, eight hundred eighty-one".