51345137 has 4 divisors (see below), whose sum is σ = 51363840. Its totient is φ = 51326436.

The previous prime is 51345121. The next prime is 51345143. The reversal of 51345137 is 73154315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51345137 - 2⁴ = 51345121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51345157) 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, 4337 + ... + 11022.

It is an arithmetic number, because the mean of its divisors is an integer number (12840960).

Almost surely, 2^51345137 is an apocalyptic number.

It is an amenable number.

51345137 is a deficient number, since it is larger than the sum of its proper divisors (18703).

51345137 is a wasteful number, since it uses less digits than its factorization.

51345137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18702.

The product of its digits is 6300, while the sum is 29.

The square root of 51345137 is about 7165.5521071303. The cubic root of 51345137 is about 371.6776435277.

The spelling of 51345137 in words is "fifty-one million, three hundred forty-five thousand, one hundred thirty-seven".