164949857 has 2 divisors, whose sum is σ = 164949858. Its totient is φ = 164949856.

The previous prime is 164949839. The next prime is 164949881. The reversal of 164949857 is 758949461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97693456 + 67256401 = 9884^2 + 8201^2 .

It is a cyclic number.

It is not a de Polignac number, because 164949857 - 2¹⁸ = 164687713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 164949799 and 164949808.

It is not a weakly prime, because it can be changed into another prime (164949817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82474928 + 82474929.

It is an arithmetic number, because the mean of its divisors is an integer number (82474929).

Almost surely, 2^164949857 is an apocalyptic number.

It is an amenable number.

164949857 is a deficient number, since it is larger than the sum of its proper divisors (1).

164949857 is an equidigital number, since it uses as much as digits as its factorization.

164949857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The square root of 164949857 is about 12843.2806167272. The cubic root of 164949857 is about 548.4250890777.

The spelling of 164949857 in words is "one hundred sixty-four million, nine hundred forty-nine thousand, eight hundred fifty-seven".