690165441 has 63 divisors (see below), whose sum is σ = 1212439761. Its totient is φ = 391542984.

The previous prime is 690165391. The next prime is 690165449. The reversal of 690165441 is 144561096.

The square root of 690165441 is 26271.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (63).

It is a de Polignac number, because none of the positive numbers 2^k-690165441 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 690165396 and 690165405.

It is not an unprimeable number, because it can be changed into a prime (690165449) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 4965150 + ... + 4965288.

Almost surely, 2^690165441 is an apocalyptic number.

690165441 is the 26271-st square number.

690165441 is the 13136-th centered octagonal number.

It is an amenable number.

690165441 is a deficient number, since it is larger than the sum of its proper divisors (522274320).

690165441 is an frugal number, since it uses more digits than its factorization.

690165441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The cubic root of 690165441 is about 883.7262111690.

Multiplying 690165441 by its sum of digits (36), we get a square (24845955876 = 157626²).

The spelling of 690165441 in words is "six hundred ninety million, one hundred sixty-five thousand, four hundred forty-one".