61211143 has 24 divisors (see below), whose sum is σ = 74856960. Its totient is φ = 49840560.

The previous prime is 61211113. The next prime is 61211167. The reversal of 61211143 is 34111216.

It is not a de Polignac number, because 61211143 - 2²¹ = 59113991 is a prime.

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 61211143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61211113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89280 + ... + 89962.

It is an arithmetic number, because the mean of its divisors is an integer number (3119040).

Almost surely, 2^61211143 is an apocalyptic number.

61211143 is a deficient number, since it is larger than the sum of its proper divisors (13645817).

61211143 is a wasteful number, since it uses less digits than its factorization.

61211143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 780 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The square root of 61211143 is about 7823.7550447340. The cubic root of 61211143 is about 394.1033831620.

Adding to 61211143 its reverse (34111216), we get a palindrome (95322359).

The spelling of 61211143 in words is "sixty-one million, two hundred eleven thousand, one hundred forty-three".