61311042 has 48 divisors (see below), whose sum is σ = 143619840. Its totient is φ = 18791136.

The previous prime is 61311037. The next prime is 61311067. The reversal of 61311042 is 24011316.

It is a happy number.

61311042 is a `hidden beast` number, since 613 + 1 + 10 + 42 = 666.

It is a super-2 number, since 2×61311042² = 7518087742251528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111813 + ... + 112359.

It is an arithmetic number, because the mean of its divisors is an integer number (2992080).

Almost surely, 2^61311042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61311042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71809920).

61311042 is an abundant number, since it is smaller than the sum of its proper divisors (82308798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61311042 is a wasteful number, since it uses less digits than its factorization.

61311042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047 (or 1044 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 61311042 is about 7830.1367804145. The cubic root of 61311042 is about 394.3176640551.

Adding to 61311042 its reverse (24011316), we get a palindrome (85322358).

The spelling of 61311042 in words is "sixty-one million, three hundred eleven thousand, forty-two".