561377271 has 72 divisors (see below), whose sum is σ = 961320960. Its totient is φ = 290332224.

The previous prime is 561377263. The next prime is 561377279. The reversal of 561377271 is 172773165.

It is an interprime number because it is at equal distance from previous prime (561377263) and next prime (561377279).

It is not a de Polignac number, because 561377271 - 2³ = 561377263 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561377279) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1465546 + ... + 1465928.

It is an arithmetic number, because the mean of its divisors is an integer number (13351680).

Almost surely, 2^561377271 is an apocalyptic number.

561377271 is a deficient number, since it is larger than the sum of its proper divisors (399943689).

561377271 is a wasteful number, since it uses less digits than its factorization.

561377271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 465 counting only the distinct ones).

The product of its digits is 61740, while the sum is 39.

The square root of 561377271 is about 23693.4014231811. The cubic root of 561377271 is about 824.9322361238.

The spelling of 561377271 in words is "five hundred sixty-one million, three hundred seventy-seven thousand, two hundred seventy-one".