61143215 has 8 divisors (see below), whose sum is σ = 83853600. Its totient is φ = 41926752.

The previous prime is 61143211. The next prime is 61143221. The reversal of 61143215 is 51234116.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61143215 - 2² = 61143211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61143211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 873440 + ... + 873509.

It is an arithmetic number, because the mean of its divisors is an integer number (10481700).

Almost surely, 2^61143215 is an apocalyptic number.

61143215 is a deficient number, since it is larger than the sum of its proper divisors (22710385).

61143215 is a wasteful number, since it uses less digits than its factorization.

61143215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746961.

The product of its digits is 720, while the sum is 23.

The square root of 61143215 is about 7819.4127017315. The cubic root of 61143215 is about 393.9575460798.

Subtracting from 61143215 its reverse (51234116), we obtain a palindrome (9909099).

The spelling of 61143215 in words is "sixty-one million, one hundred forty-three thousand, two hundred fifteen".