690255261 has 6 divisors (see below), whose sum is σ = 997035390. Its totient is φ = 460170168.

The previous prime is 690255257. The next prime is 690255263. The reversal of 690255261 is 162552096.

690255261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 681523236 + 8732025 = 26106^2 + 2955^2 .

It is not a de Polignac number, because 690255261 - 2² = 690255257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690255263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38347506 + ... + 38347523.

It is an arithmetic number, because the mean of its divisors is an integer number (166172565).

Almost surely, 2^690255261 is an apocalyptic number.

It is an amenable number.

690255261 is a deficient number, since it is larger than the sum of its proper divisors (306780129).

690255261 is a wasteful number, since it uses less digits than its factorization.

690255261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76695035 (or 76695032 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 690255261 is about 26272.7094339354. The cubic root of 690255261 is about 883.7645463470.

The spelling of 690255261 in words is "six hundred ninety million, two hundred fifty-five thousand, two hundred sixty-one".