51240042997 has 8 divisors (see below), whose sum is σ = 60198092640. Its totient is φ = 42998637360.

The previous prime is 51240042991. The next prime is 51240043013. The reversal of 51240042997 is 79924004215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51240042997 - 2⁷ = 51240042869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51240042991) 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 7 ways as a sum of consecutive naturals, for example, 179160847 + ... + 179161132.

It is an arithmetic number, because the mean of its divisors is an integer number (7524761580).

Almost surely, 2^51240042997 is an apocalyptic number.

It is an amenable number.

51240042997 is a deficient number, since it is larger than the sum of its proper divisors (8958049643).

51240042997 is a wasteful number, since it uses less digits than its factorization.

51240042997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358322003.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 51240042997 in words is "fifty-one billion, two hundred forty million, forty-two thousand, nine hundred ninety-seven".