49171819 has 2 divisors, whose sum is σ = 49171820. Its totient is φ = 49171818.

The previous prime is 49171813. The next prime is 49171873. The reversal of 49171819 is 91817194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 49171819 - 2¹⁹ = 48647531 is a prime.

It is a super-2 number, since 2×49171819² = 4835735567537522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (49171813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24585909 + 24585910.

It is an arithmetic number, because the mean of its divisors is an integer number (24585910).

Almost surely, 2^49171819 is an apocalyptic number.

49171819 is a deficient number, since it is larger than the sum of its proper divisors (1).

49171819 is an equidigital number, since it uses as much as digits as its factorization.

49171819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 40.

The square root of 49171819 is about 7012.2620458736. The cubic root of 49171819 is about 366.3577851409.

The spelling of 49171819 in words is "forty-nine million, one hundred seventy-one thousand, eight hundred nineteen".