51391007 has 8 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 50531320.

The previous prime is 51390959. The next prime is 51391013. The reversal of 51391007 is 70019315.

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 51391007 - 2⁸ = 51390751 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 (51391037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34994 + ... + 36432.

It is an arithmetic number, because the mean of its divisors is an integer number (6531840).

Almost surely, 2^51391007 is an apocalyptic number.

51391007 is a deficient number, since it is larger than the sum of its proper divisors (863713).

51391007 is a wasteful number, since it uses less digits than its factorization.

51391007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013.

The product of its (nonzero) digits is 945, while the sum is 26.

The square root of 51391007 is about 7168.7521229291. The cubic root of 51391007 is about 371.7882919751.

The spelling of 51391007 in words is "fifty-one million, three hundred ninety-one thousand, seven".