661130051 has 4 divisors (see below), whose sum is σ = 700020072. Its totient is φ = 622240032.

The previous prime is 661130047. The next prime is 661130089. The reversal of 661130051 is 150031166.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661130051 - 2² = 661130047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661129999 and 661130026.

It is not an unprimeable number, because it can be changed into a prime (661130021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19444985 + ... + 19445018.

It is an arithmetic number, because the mean of its divisors is an integer number (175005018).

Almost surely, 2^661130051 is an apocalyptic number.

661130051 is a deficient number, since it is larger than the sum of its proper divisors (38890021).

661130051 is a wasteful number, since it uses less digits than its factorization.

661130051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38890020.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 661130051 is about 25712.4493387931. The cubic root of 661130051 is about 871.1553993237.

The spelling of 661130051 in words is "six hundred sixty-one million, one hundred thirty thousand, fifty-one".