51206903 has 4 divisors (see below), whose sum is σ = 55862088. Its totient is φ = 46551720.

The previous prime is 51206893. The next prime is 51206921. The reversal of 51206903 is 30960215.

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 51206903 - 2¹⁰ = 51205879 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 (51206503) 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, 2327576 + ... + 2327597.

It is an arithmetic number, because the mean of its divisors is an integer number (13965522).

Almost surely, 2^51206903 is an apocalyptic number.

51206903 is a deficient number, since it is larger than the sum of its proper divisors (4655185).

51206903 is a wasteful number, since it uses less digits than its factorization.

51206903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4655184.

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

The square root of 51206903 is about 7155.8998735309. The cubic root of 51206903 is about 371.3437939015.

The spelling of 51206903 in words is "fifty-one million, two hundred six thousand, nine hundred three".