51140987 has 2 divisors, whose sum is σ = 51140988. Its totient is φ = 51140986.

The previous prime is 51140977. The next prime is 51141011. The reversal of 51140987 is 78904115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51140987 - 2²⁰ = 50092411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51140927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25570493 + 25570494.

It is an arithmetic number, because the mean of its divisors is an integer number (25570494).

Almost surely, 2^51140987 is an apocalyptic number.

51140987 is a deficient number, since it is larger than the sum of its proper divisors (1).

51140987 is an equidigital number, since it uses as much as digits as its factorization.

51140987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 51140987 is about 7151.2926803481. The cubic root of 51140987 is about 371.1843882584.

The spelling of 51140987 in words is "fifty-one million, one hundred forty thousand, nine hundred eighty-seven".