691125801 has 4 divisors (see below), whose sum is σ = 921501072. Its totient is φ = 460750532.

The previous prime is 691125761. The next prime is 691125833. The reversal of 691125801 is 108521196.

691125801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 691125801 - 2⁶ = 691125737 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (691125881) 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, 115187631 + ... + 115187636.

It is an arithmetic number, because the mean of its divisors is an integer number (230375268).

Almost surely, 2^691125801 is an apocalyptic number.

It is an amenable number.

691125801 is a deficient number, since it is larger than the sum of its proper divisors (230375271).

691125801 is a wasteful number, since it uses less digits than its factorization.

691125801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230375270.

The product of its (nonzero) digits is 4320, while the sum is 33.

The square root of 691125801 is about 26289.2715950823. The cubic root of 691125801 is about 884.1359206419.

Adding to 691125801 its reverse (108521196), we get a palindrome (799646997).

The spelling of 691125801 in words is "six hundred ninety-one million, one hundred twenty-five thousand, eight hundred one".