49820161 has 4 divisors (see below), whose sum is σ = 49872132. Its totient is φ = 49768192.

The previous prime is 49820143. The next prime is 49820179. The reversal of 49820161 is 16102894.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16102894 = 2 ⋅8051447.

It is an interprime number because it is at equal distance from previous prime (49820143) and next prime (49820179).

It can be written as a sum of positive squares in 2 ways, for example, as 20875761 + 28944400 = 4569^2 + 5380^2 .

It is a cyclic number.

It is not a de Polignac number, because 49820161 - 2¹³ = 49811969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49820861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24520 + ... + 26473.

It is an arithmetic number, because the mean of its divisors is an integer number (12468033).

Almost surely, 2^49820161 is an apocalyptic number.

It is an amenable number.

49820161 is a deficient number, since it is larger than the sum of its proper divisors (51971).

49820161 is an equidigital number, since it uses as much as digits as its factorization.

49820161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51970.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 49820161 is about 7058.3398189659. The cubic root of 49820161 is about 367.9609308909.

The spelling of 49820161 in words is "forty-nine million, eight hundred twenty thousand, one hundred sixty-one".