689902541 has 4 divisors (see below), whose sum is σ = 694471584. Its totient is φ = 685333500.

The previous prime is 689902523. The next prime is 689902561. The reversal of 689902541 is 145209986.

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 a de Polignac number, because none of the positive numbers 2^k-689902541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 689902492 and 689902501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689902501) 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, 2284295 + ... + 2284596.

It is an arithmetic number, because the mean of its divisors is an integer number (173617896).

Almost surely, 2^689902541 is an apocalyptic number.

It is an amenable number.

689902541 is a deficient number, since it is larger than the sum of its proper divisors (4569043).

689902541 is a wasteful number, since it uses less digits than its factorization.

689902541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4569042.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 689902541 is about 26265.9959072562. The cubic root of 689902541 is about 883.6139863247.

The spelling of 689902541 in words is "six hundred eighty-nine million, nine hundred two thousand, five hundred forty-one".