61831161 has 48 divisors (see below), whose sum is σ = 108700800. Its totient is φ = 34026048.

The previous prime is 61831141. The next prime is 61831163. The reversal of 61831161 is 16113816.

61831161 is a `hidden beast` number, since 618 + 31 + 16 + 1 = 666.

It is not a de Polignac number, because 61831161 - 2¹⁸ = 61569017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61831163) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 158755 + ... + 159143.

It is an arithmetic number, because the mean of its divisors is an integer number (2264600).

Almost surely, 2^61831161 is an apocalyptic number.

It is an amenable number.

61831161 is a deficient number, since it is larger than the sum of its proper divisors (46869639).

61831161 is a wasteful number, since it uses less digits than its factorization.

61831161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 428 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 61831161 is about 7863.2792777568. The cubic root of 61831161 is about 395.4295620580.

Adding to 61831161 its reverse (16113816), we get a palindrome (77944977).

The spelling of 61831161 in words is "sixty-one million, eight hundred thirty-one thousand, one hundred sixty-one".