51849137 has 4 divisors (see below), whose sum is σ = 52036596. Its totient is φ = 51661680.

The previous prime is 51849121. The next prime is 51849139. The reversal of 51849137 is 73194815.

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 4844401 + 47004736 = 2201^2 + 6856^2 .

It is a cyclic number.

It is not a de Polignac number, because 51849137 - 2⁴ = 51849121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51849137.

It is not an unprimeable number, because it can be changed into a prime (51849139) 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, 93314 + ... + 93867.

It is an arithmetic number, because the mean of its divisors is an integer number (13009149).

Almost surely, 2^51849137 is an apocalyptic number.

It is an amenable number.

51849137 is a deficient number, since it is larger than the sum of its proper divisors (187459).

51849137 is a wasteful number, since it uses less digits than its factorization.

51849137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187458.

The product of its digits is 30240, while the sum is 38.

The square root of 51849137 is about 7200.6344859325. The cubic root of 51849137 is about 372.8898058962.

The spelling of 51849137 in words is "fifty-one million, eight hundred forty-nine thousand, one hundred thirty-seven".