690561101 has 4 divisors (see below), whose sum is σ = 691758492. Its totient is φ = 689363712.

The previous prime is 690561089. The next prime is 690561127. The reversal of 690561101 is 101165096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 481758601 + 208802500 = 21949^2 + 14450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690561101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690561181) 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, 597830 + ... + 598983.

It is an arithmetic number, because the mean of its divisors is an integer number (172939623).

Almost surely, 2^690561101 is an apocalyptic number.

It is an amenable number.

690561101 is a deficient number, since it is larger than the sum of its proper divisors (1197391).

690561101 is a wasteful number, since it uses less digits than its factorization.

690561101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197390.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 690561101 is about 26278.5292777202. The cubic root of 690561101 is about 883.8950539305.

The spelling of 690561101 in words is "six hundred ninety million, five hundred sixty-one thousand, one hundred one".