49897181 has 4 divisors (see below), whose sum is σ = 50261532. Its totient is φ = 49532832.

The previous prime is 49897171. The next prime is 49897223. The reversal of 49897181 is 18179894.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18179894 = 2 ⋅9089947.

It can be written as a sum of positive squares in 2 ways, for example, as 12013156 + 37884025 = 3466^2 + 6155^2 .

It is a cyclic number.

It is not a de Polignac number, because 49897181 - 2⁶ = 49897117 is a prime.

It is a super-2 number, since 2×49897181² = 4979457343493522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49897121) 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, 181970 + ... + 182243.

It is an arithmetic number, because the mean of its divisors is an integer number (12565383).

Almost surely, 2^49897181 is an apocalyptic number.

It is an amenable number.

49897181 is a deficient number, since it is larger than the sum of its proper divisors (364351).

49897181 is a wasteful number, since it uses less digits than its factorization.

49897181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364350.

The product of its digits is 145152, while the sum is 47.

The square root of 49897181 is about 7063.7936691271. The cubic root of 49897181 is about 368.1504509467.

It can be divided in two parts, 498 and 97181, that added together give a palindrome (97679).

The spelling of 49897181 in words is "forty-nine million, eight hundred ninety-seven thousand, one hundred eighty-one".