164540251 has 2 divisors, whose sum is σ = 164540252. Its totient is φ = 164540250.

The previous prime is 164540237. The next prime is 164540261. The reversal of 164540251 is 152045461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164540251 is a prime.

It is not a weakly prime, because it can be changed into another prime (164540261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82270125 + 82270126.

It is an arithmetic number, because the mean of its divisors is an integer number (82270126).

Almost surely, 2^164540251 is an apocalyptic number.

164540251 is a deficient number, since it is larger than the sum of its proper divisors (1).

164540251 is an equidigital number, since it uses as much as digits as its factorization.

164540251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 164540251 is about 12827.3243897549. The cubic root of 164540251 is about 547.9707602901.

The spelling of 164540251 in words is "one hundred sixty-four million, five hundred forty thousand, two hundred fifty-one".