51031901 has 4 divisors (see below), whose sum is σ = 51083292. Its totient is φ = 50980512.

The previous prime is 51031879. The next prime is 51031907. The reversal of 51031901 is 10913015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10913015 = 5 ⋅2182603.

It can be written as a sum of positive squares in 2 ways, for example, as 13147876 + 37884025 = 3626^2 + 6155^2 .

It is a cyclic number.

It is not a de Polignac number, because 51031901 - 2¹⁰ = 51030877 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 (51031907) 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, 24176 + ... + 26201.

It is an arithmetic number, because the mean of its divisors is an integer number (12770823).

Almost surely, 2^51031901 is an apocalyptic number.

It is an amenable number.

51031901 is a deficient number, since it is larger than the sum of its proper divisors (51391).

51031901 is a wasteful number, since it uses less digits than its factorization.

51031901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51390.

The product of its (nonzero) digits is 135, while the sum is 20.

The square root of 51031901 is about 7143.6615961284. The cubic root of 51031901 is about 370.9202827829.

Adding to 51031901 its reverse (10913015), we get a palindrome (61944916).

The spelling of 51031901 in words is "fifty-one million, thirty-one thousand, nine hundred one".