51540137 has 4 divisors (see below), whose sum is σ = 56225616. Its totient is φ = 46854660.

The previous prime is 51540121. The next prime is 51540161. The reversal of 51540137 is 73104515.

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 51540137 - 2⁴ = 51540121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51540037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2342723 + ... + 2342744.

It is an arithmetic number, because the mean of its divisors is an integer number (14056404).

Almost surely, 2^51540137 is an apocalyptic number.

It is an amenable number.

51540137 is a deficient number, since it is larger than the sum of its proper divisors (4685479).

51540137 is a wasteful number, since it uses less digits than its factorization.

51540137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685478.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 51540137 is about 7179.1459798502. The cubic root of 51540137 is about 372.1475717164.

The spelling of 51540137 in words is "fifty-one million, five hundred forty thousand, one hundred thirty-seven".