61244215 has 8 divisors (see below), whose sum is σ = 73987200. Its totient is φ = 48665952.

The previous prime is 61244177. The next prime is 61244221. The reversal of 61244215 is 51244216.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61244215 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61244215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40359 + ... + 41848.

It is an arithmetic number, because the mean of its divisors is an integer number (9248400).

Almost surely, 2^61244215 is an apocalyptic number.

61244215 is a deficient number, since it is larger than the sum of its proper divisors (12742985).

61244215 is a wasteful number, since it uses less digits than its factorization.

61244215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82361.

The product of its digits is 1920, while the sum is 25.

The square root of 61244215 is about 7825.8683224291. The cubic root of 61244215 is about 394.1743475855.

Subtracting from 61244215 its reverse (51244216), we obtain a palindrome (9999999).

The spelling of 61244215 in words is "sixty-one million, two hundred forty-four thousand, two hundred fifteen".