61222215 has 8 divisors (see below), whose sum is σ = 97955568. Its totient is φ = 32651840.

The previous prime is 61222207. The next prime is 61222243. The reversal of 61222215 is 51222216.

It is a happy number.

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

It is not a de Polignac number, because 61222215 - 2³ = 61222207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61222191 and 61222200.

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, 2040726 + ... + 2040755.

It is an arithmetic number, because the mean of its divisors is an integer number (12244446).

Almost surely, 2^61222215 is an apocalyptic number.

61222215 is a deficient number, since it is larger than the sum of its proper divisors (36733353).

61222215 is a wasteful number, since it uses less digits than its factorization.

61222215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081489.

The product of its digits is 480, while the sum is 21.

The square root of 61222215 is about 7824.4626013548. The cubic root of 61222215 is about 394.1271438117.

Subtracting from 61222215 its reverse (51222216), we obtain a palindrome (9999999).

It can be divided in two parts, 6 and 1222215, that added together give a palindrome (1222221).

The spelling of 61222215 in words is "sixty-one million, two hundred twenty-two thousand, two hundred fifteen".