553640261 has 4 divisors (see below), whose sum is σ = 567143724. Its totient is φ = 540136800.

The previous prime is 553640257. The next prime is 553640267. The reversal of 553640261 is 162046355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162046355 = 5 ⋅32409271.

It can be written as a sum of positive squares in 2 ways, for example, as 55502500 + 498137761 = 7450^2 + 22319^2 .

It is a cyclic number.

It is not a de Polignac number, because 553640261 - 2² = 553640257 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 (553640267) 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, 6751670 + ... + 6751751.

It is an arithmetic number, because the mean of its divisors is an integer number (141785931).

Almost surely, 2^553640261 is an apocalyptic number.

It is an amenable number.

553640261 is a deficient number, since it is larger than the sum of its proper divisors (13503463).

553640261 is a wasteful number, since it uses less digits than its factorization.

553640261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13503462.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 553640261 is about 23529.5614281270. The cubic root of 553640261 is about 821.1248992152.

The spelling of 553640261 in words is "five hundred fifty-three million, six hundred forty thousand, two hundred sixty-one".