697881601 has 4 divisors (see below), whose sum is σ = 697936900. Its totient is φ = 697826304.

The previous prime is 697881599. The next prime is 697881629. The reversal of 697881601 is 106188796.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 138086001 + 559795600 = 11751^2 + 23660^2 .

It is a cyclic number.

It is not a de Polignac number, because 697881601 - 2¹ = 697881599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (697881661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1585 + ... + 37393.

It is an arithmetic number, because the mean of its divisors is an integer number (174484225).

Almost surely, 2^697881601 is an apocalyptic number.

It is an amenable number.

697881601 is a deficient number, since it is larger than the sum of its proper divisors (55299).

697881601 is a wasteful number, since it uses less digits than its factorization.

697881601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55298.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 697881601 is about 26417.4487980955. The cubic root of 697881601 is about 887.0074133804.

The spelling of 697881601 in words is "six hundred ninety-seven million, eight hundred eighty-one thousand, six hundred one".