51402187 has 2 divisors, whose sum is σ = 51402188. Its totient is φ = 51402186.

The previous prime is 51402041. The next prime is 51402193. The reversal of 51402187 is 78120415.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51402187 - 2¹⁹ = 50877899 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51402787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25701093 + 25701094.

It is an arithmetic number, because the mean of its divisors is an integer number (25701094).

Almost surely, 2^51402187 is an apocalyptic number.

51402187 is a deficient number, since it is larger than the sum of its proper divisors (1).

51402187 is an equidigital number, since it uses as much as digits as its factorization.

51402187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 51402187 is about 7169.5318536150. The cubic root of 51402187 is about 371.8152505940.

The spelling of 51402187 in words is "fifty-one million, four hundred two thousand, one hundred eighty-seven".