654311261 has 4 divisors (see below), whose sum is σ = 655158492. Its totient is φ = 653464032.

The previous prime is 654311257. The next prime is 654311267. The reversal of 654311261 is 162113456.

It is a happy number.

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 288354361 + 365956900 = 16981^2 + 19130^2 .

It is a cyclic number.

It is not a de Polignac number, because 654311261 - 2² = 654311257 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 (654311267) 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, 422456 + ... + 424001.

It is an arithmetic number, because the mean of its divisors is an integer number (163789623).

Almost surely, 2^654311261 is an apocalyptic number.

It is an amenable number.

654311261 is a deficient number, since it is larger than the sum of its proper divisors (847231).

654311261 is an equidigital number, since it uses as much as digits as its factorization.

654311261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847230.

The product of its digits is 4320, while the sum is 29.

The square root of 654311261 is about 25579.5086152960. The cubic root of 654311261 is about 868.1500573213.

The spelling of 654311261 in words is "six hundred fifty-four million, three hundred eleven thousand, two hundred sixty-one".