561738731 has 2 divisors, whose sum is σ = 561738732. Its totient is φ = 561738730.

The previous prime is 561738703. The next prime is 561738739. The reversal of 561738731 is 137837165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561738731 - 2¹⁰ = 561737707 is a prime.

It is a super-2 number, since 2×561738731² = 631100803810980722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (561738739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280869365 + 280869366.

It is an arithmetic number, because the mean of its divisors is an integer number (280869366).

Almost surely, 2^561738731 is an apocalyptic number.

561738731 is a deficient number, since it is larger than the sum of its proper divisors (1).

561738731 is an equidigital number, since it uses as much as digits as its factorization.

561738731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 41.

The square root of 561738731 is about 23701.0280578712. The cubic root of 561738731 is about 825.1092507905.

The spelling of 561738731 in words is "five hundred sixty-one million, seven hundred thirty-eight thousand, seven hundred thirty-one".