49161981831 has 16 divisors (see below), whose sum is σ = 65674312704. Its totient is φ = 32712197024.

The previous prime is 49161981769. The next prime is 49161981859. The reversal of 49161981831 is 13818916194.

49161981831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 49161981831 - 2⁶ = 49161981767 is a prime.

It is a super-2 number, since 2×49161981831² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49161981031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7159906 + ... + 7166768.

It is an arithmetic number, because the mean of its divisors is an integer number (4104644544).

Almost surely, 2^49161981831 is an apocalyptic number.

49161981831 is a deficient number, since it is larger than the sum of its proper divisors (16512330873).

49161981831 is a wasteful number, since it uses less digits than its factorization.

49161981831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11070.

The product of its digits is 373248, while the sum is 51.

The spelling of 49161981831 in words is "forty-nine billion, one hundred sixty-one million, nine hundred eighty-one thousand, eight hundred thirty-one".