51001039 has 4 divisors (see below), whose sum is σ = 51046056. Its totient is φ = 50956024.

The previous prime is 51001031. The next prime is 51001043. The reversal of 51001039 is 93010015.

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 51001039 - 2³ = 51001031 is a prime.

It is a super-2 number, since 2×51001039² = 5202211958159042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51001031) 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, 20764 + ... + 23089.

It is an arithmetic number, because the mean of its divisors is an integer number (12761514).

Almost surely, 2^51001039 is an apocalyptic number.

51001039 is a deficient number, since it is larger than the sum of its proper divisors (45017).

51001039 is a wasteful number, since it uses less digits than its factorization.

51001039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45016.

The product of its (nonzero) digits is 135, while the sum is 19.

The square root of 51001039 is about 7141.5011727227. The cubic root of 51001039 is about 370.8454952484.

The spelling of 51001039 in words is "fifty-one million, one thousand, thirty-nine".