691120401 has 8 divisors (see below), whose sum is σ = 921850560. Its totient is φ = 460568592.

The previous prime is 691120379. The next prime is 691120457. The reversal of 691120401 is 104021196.

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

It is not a de Polignac number, because 691120401 - 2¹⁷ = 690989329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (691100401) 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, 35266 + ... + 51243.

It is an arithmetic number, because the mean of its divisors is an integer number (115231320).

Almost surely, 2^691120401 is an apocalyptic number.

It is an amenable number.

691120401 is a deficient number, since it is larger than the sum of its proper divisors (230730159).

691120401 is a wasteful number, since it uses less digits than its factorization.

691120401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89175.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 691120401 is about 26289.1688913895. The cubic root of 691120401 is about 884.1336179514.

Adding to 691120401 its reverse (104021196), we get a palindrome (795141597).

The spelling of 691120401 in words is "six hundred ninety-one million, one hundred twenty thousand, four hundred one".