2365531561 has 2 divisors, whose sum is σ = 2365531562. Its totient is φ = 2365531560.

The previous prime is 2365531529. The next prime is 2365531631. The reversal of 2365531561 is 1651355632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1434061161 + 931470400 = 37869^2 + 30520^2 .

It is a cyclic number.

It is not a de Polignac number, because 2365531561 - 2⁵ = 2365531529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2365531561.

It is not a weakly prime, because it can be changed into another prime (2365531661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1182765780 + 1182765781.

It is an arithmetic number, because the mean of its divisors is an integer number (1182765781).

Almost surely, 2^2365531561 is an apocalyptic number.

It is an amenable number.

2365531561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2365531561 is an equidigital number, since it uses as much as digits as its factorization.

2365531561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81000, while the sum is 37.

The square root of 2365531561 is about 48636.7305747416. The cubic root of 2365531561 is about 1332.4254385120.

The spelling of 2365531561 in words is "two billion, three hundred sixty-five million, five hundred thirty-one thousand, five hundred sixty-one".