61012143 has 32 divisors (see below), whose sum is σ = 94982400. Its totient is φ = 38652768.

The previous prime is 61012129. The next prime is 61012187. The reversal of 61012143 is 34121016.

It is a happy number.

61012143 is a `hidden beast` number, since 610 + 12 + 1 + 43 = 666.

It is not a de Polignac number, because 61012143 - 2⁸ = 61011887 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61012043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51880 + ... + 53042.

It is an arithmetic number, because the mean of its divisors is an integer number (2968200).

Almost surely, 2^61012143 is an apocalyptic number.

61012143 is a deficient number, since it is larger than the sum of its proper divisors (33970257).

61012143 is a wasteful number, since it uses less digits than its factorization.

61012143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268 (or 1262 counting only the distinct ones).

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

The square root of 61012143 is about 7811.0270131398. The cubic root of 61012143 is about 393.6758372795.

Adding to 61012143 its reverse (34121016), we get a palindrome (95133159).

The spelling of 61012143 in words is "sixty-one million, twelve thousand, one hundred forty-three".