51906023 has 4 divisors (see below), whose sum is σ = 55898808. Its totient is φ = 47913240.

The previous prime is 51906013. The next prime is 51906061. The reversal of 51906023 is 32060915.

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 51906023 - 2⁴ = 51906007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51905983 and 51906001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51906013) 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, 1996373 + ... + 1996398.

It is an arithmetic number, because the mean of its divisors is an integer number (13974702).

Almost surely, 2^51906023 is an apocalyptic number.

51906023 is a deficient number, since it is larger than the sum of its proper divisors (3992785).

51906023 is a wasteful number, since it uses less digits than its factorization.

51906023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992784.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 51906023 is about 7204.5834716519. The cubic root of 51906023 is about 373.0261273976.

Adding to 51906023 its reverse (32060915), we get a palindrome (83966938).

The spelling of 51906023 in words is "fifty-one million, nine hundred six thousand, twenty-three".