2115124561 has 4 divisors (see below), whose sum is σ = 2307408624. Its totient is φ = 1922840500.

The previous prime is 2115124481. The next prime is 2115124579. The reversal of 2115124561 is 1654215112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2115124561 - 2¹³ = 2115116369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2115125561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96142015 + ... + 96142036.

It is an arithmetic number, because the mean of its divisors is an integer number (576852156).

Almost surely, 2^2115124561 is an apocalyptic number.

It is an amenable number.

2115124561 is a deficient number, since it is larger than the sum of its proper divisors (192284063).

2115124561 is a wasteful number, since it uses less digits than its factorization.

2115124561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192284062.

The product of its digits is 2400, while the sum is 28.

The square root of 2115124561 is about 45990.4833742808. The cubic root of 2115124561 is about 1283.6461308856.

Adding to 2115124561 its reverse (1654215112), we get a palindrome (3769339673).

The spelling of 2115124561 in words is "two billion, one hundred fifteen million, one hundred twenty-four thousand, five hundred sixty-one".