689221901 has 4 divisors (see below), whose sum is σ = 689903292. Its totient is φ = 688540512.

The previous prime is 689221867. The next prime is 689221913. The reversal of 689221901 is 109122986.

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 31248100 + 657973801 = 5590^2 + 25651^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689221901 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 (689221961) 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, 339176 + ... + 341201.

It is an arithmetic number, because the mean of its divisors is an integer number (172475823).

Almost surely, 2^689221901 is an apocalyptic number.

It is an amenable number.

689221901 is a deficient number, since it is larger than the sum of its proper divisors (681391).

689221901 is a wasteful number, since it uses less digits than its factorization.

689221901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681390.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 689221901 is about 26253.0360339523. The cubic root of 689221901 is about 883.3233071446.

The spelling of 689221901 in words is "six hundred eighty-nine million, two hundred twenty-one thousand, nine hundred one".