61513143 has 4 divisors (see below), whose sum is σ = 82017528. Its totient is φ = 41008760.

The previous prime is 61513139. The next prime is 61513183. The reversal of 61513143 is 34131516.

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 61513143 - 2² = 61513139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61513183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10252188 + ... + 10252193.

It is an arithmetic number, because the mean of its divisors is an integer number (20504382).

Almost surely, 2^61513143 is an apocalyptic number.

61513143 is a deficient number, since it is larger than the sum of its proper divisors (20504385).

61513143 is a wasteful number, since it uses less digits than its factorization.

61513143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20504384.

The product of its digits is 1080, while the sum is 24.

The square root of 61513143 is about 7843.0314929879. The cubic root of 61513143 is about 394.7504549963.

Adding to 61513143 its reverse (34131516), we get a palindrome (95644659).

The spelling of 61513143 in words is "sixty-one million, five hundred thirteen thousand, one hundred forty-three".