1234011561 has 16 divisors (see below), whose sum is σ = 1701428544. Its totient is φ = 795098304.

The previous prime is 1234011551. The next prime is 1234011587. The reversal of 1234011561 is 1651104321.

It is a happy number.

It is not a de Polignac number, because 1234011561 - 2⁵ = 1234011529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1234011551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47266 + ... + 68571.

It is an arithmetic number, because the mean of its divisors is an integer number (106339284).

Almost surely, 2^1234011561 is an apocalyptic number.

It is an amenable number.

1234011561 is a deficient number, since it is larger than the sum of its proper divisors (467416983).

1234011561 is a wasteful number, since it uses less digits than its factorization.

1234011561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115960.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1234011561 is about 35128.5006938810. The cubic root of 1234011561 is about 1072.6048165064.

Adding to 1234011561 its reverse (1651104321), we get a palindrome (2885115882).

The spelling of 1234011561 in words is "one billion, two hundred thirty-four million, eleven thousand, five hundred sixty-one".