634001691 has 8 divisors (see below), whose sum is σ = 846412864. Its totient is φ = 422129160.

The previous prime is 634001681. The next prime is 634001701. The reversal of 634001691 is 196100436.

It is an interprime number because it is at equal distance from previous prime (634001681) and next prime (634001701).

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

It is not a de Polignac number, because 634001691 - 2¹¹ = 633999643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634001681) 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, 131905 + ... + 136626.

It is an arithmetic number, because the mean of its divisors is an integer number (105801608).

Almost surely, 2^634001691 is an apocalyptic number.

634001691 is a deficient number, since it is larger than the sum of its proper divisors (212411173).

634001691 is a wasteful number, since it uses less digits than its factorization.

634001691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269321.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 634001691 is about 25179.3902031006. The cubic root of 634001691 is about 859.0731365515.

The spelling of 634001691 in words is "six hundred thirty-four million, one thousand, six hundred ninety-one".