6121501561 has 16 divisors (see below), whose sum is σ = 7024800384. Its totient is φ = 5225451264.

The previous prime is 6121501549. The next prime is 6121501571. The reversal of 6121501561 is 1651051216.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6121501561 is a prime.

It is a super-2 number, since 2×6121501561² = 74945562722650873442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6121501571) 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, 2068695 + ... + 2071651.

It is an arithmetic number, because the mean of its divisors is an integer number (439050024).

Almost surely, 2^6121501561 is an apocalyptic number.

It is an amenable number.

6121501561 is a deficient number, since it is larger than the sum of its proper divisors (903298823).

6121501561 is a wasteful number, since it uses less digits than its factorization.

6121501561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 6121501561 is about 78240.0253131350. The cubic root of 6121501561 is about 1829.3044387953.

Adding to 6121501561 its reverse (1651051216), we get a palindrome (7772552777).

The spelling of 6121501561 in words is "six billion, one hundred twenty-one million, five hundred one thousand, five hundred sixty-one".