561129550 has 24 divisors (see below), whose sum is σ = 1063398456. Its totient is φ = 220215840.

The previous prime is 561129521. The next prime is 561129559. The reversal of 561129550 is 55921165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561129559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103224 + ... + 108523.

It is an arithmetic number, because the mean of its divisors is an integer number (44308269).

Almost surely, 2^561129550 is an apocalyptic number.

561129550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

561129550 is a deficient number, since it is larger than the sum of its proper divisors (502268906).

561129550 is a wasteful number, since it uses less digits than its factorization.

561129550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211812 (or 211807 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 34.

The square root of 561129550 is about 23688.1732094309. The cubic root of 561129550 is about 824.8108779838.

The spelling of 561129550 in words is "five hundred sixty-one million, one hundred twenty-nine thousand, five hundred fifty".