51206437 has 4 divisors (see below), whose sum is σ = 51235596. Its totient is φ = 51177280.

The previous prime is 51206429. The next prime is 51206447. The reversal of 51206437 is 73460215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35832196 + 15374241 = 5986^2 + 3921^2 .

It is a cyclic number.

It is not a de Polignac number, because 51206437 - 2³ = 51206429 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 (51206447) 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, 11764 + ... + 15517.

It is an arithmetic number, because the mean of its divisors is an integer number (12808899).

Almost surely, 2^51206437 is an apocalyptic number.

It is an amenable number.

51206437 is a deficient number, since it is larger than the sum of its proper divisors (29159).

51206437 is a wasteful number, since it uses less digits than its factorization.

51206437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29158.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 51206437 is about 7155.8673129118. The cubic root of 51206437 is about 371.3426674470.

The spelling of 51206437 in words is "fifty-one million, two hundred six thousand, four hundred thirty-seven".