51101603521 has 4 divisors (see below), whose sum is σ = 51102426544. Its totient is φ = 51100780500.

The previous prime is 51101603491. The next prime is 51101603561. The reversal of 51101603521 is 12530610115.

It is a happy number.

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 51101603521 - 2⁵ = 51101603489 is a prime.

It is a super-2 number, since 2×51101603521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51101603561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310035 + ... + 445336.

It is an arithmetic number, because the mean of its divisors is an integer number (12775606636).

Almost surely, 2^51101603521 is an apocalyptic number.

It is an amenable number.

51101603521 is a deficient number, since it is larger than the sum of its proper divisors (823023).

51101603521 is an equidigital number, since it uses as much as digits as its factorization.

51101603521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823022.

The product of its (nonzero) digits is 900, while the sum is 25.

The spelling of 51101603521 in words is "fifty-one billion, one hundred one million, six hundred three thousand, five hundred twenty-one".