61142033431 has 4 divisors (see below), whose sum is σ = 61151597752. Its totient is φ = 61132469112.

The previous prime is 61142033423. The next prime is 61142033453. The reversal of 61142033431 is 13433024116.

61142033431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61142033431 - 2³ = 61142033423 is a prime.

It is a super-2 number, since 2×61142033431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61142033431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61142033131) 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, 4772565 + ... + 4785358.

It is an arithmetic number, because the mean of its divisors is an integer number (15287899438).

Almost surely, 2^61142033431 is an apocalyptic number.

61142033431 is a deficient number, since it is larger than the sum of its proper divisors (9564321).

61142033431 is an equidigital number, since it uses as much as digits as its factorization.

61142033431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9564320.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 61142033431 its reverse (13433024116), we get a palindrome (74575057547).

The spelling of 61142033431 in words is "sixty-one billion, one hundred forty-two million, thirty-three thousand, four hundred thirty-one".