51091444801 has 4 divisors (see below), whose sum is σ = 51189134512. Its totient is φ = 50993755092.

The previous prime is 51091444787. The next prime is 51091444849. The reversal of 51091444801 is 10844419015.

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 51091444801 - 2⁷ = 51091444673 is a prime.

It is a super-2 number, since 2×51091444801² (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 (51091444601) 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, 48844071 + ... + 48845116.

It is an arithmetic number, because the mean of its divisors is an integer number (12797283628).

Almost surely, 2^51091444801 is an apocalyptic number.

It is an amenable number.

51091444801 is a deficient number, since it is larger than the sum of its proper divisors (97689711).

51091444801 is an equidigital number, since it uses as much as digits as its factorization.

51091444801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97689710.

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 51091444801 in words is "fifty-one billion, ninety-one million, four hundred forty-four thousand, eight hundred one".