561261739 has 2 divisors, whose sum is σ = 561261740. Its totient is φ = 561261738.

The previous prime is 561261719. The next prime is 561261781. The reversal of 561261739 is 937162165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561261739 - 2⁵ = 561261707 is a prime.

It is not a weakly prime, because it can be changed into another prime (561261719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280630869 + 280630870.

It is an arithmetic number, because the mean of its divisors is an integer number (280630870).

Almost surely, 2^561261739 is an apocalyptic number.

561261739 is a deficient number, since it is larger than the sum of its proper divisors (1).

561261739 is an equidigital number, since it uses as much as digits as its factorization.

561261739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 561261739 is about 23690.9632349552. The cubic root of 561261739 is about 824.8756416167.

The spelling of 561261739 in words is "five hundred sixty-one million, two hundred sixty-one thousand, seven hundred thirty-nine".