61220115 has 24 divisors (see below), whose sum is σ = 115762608. Its totient is φ = 29682240.

The previous prime is 61220113. The next prime is 61220129. The reversal of 61220115 is 51102216.

It is not a de Polignac number, because 61220115 - 2¹ = 61220113 is a prime.

It is a super-2 number, since 2×61220115² = 7495804961226450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61220113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61344 + ... + 62333.

It is an arithmetic number, because the mean of its divisors is an integer number (4823442).

Almost surely, 2^61220115 is an apocalyptic number.

61220115 is a deficient number, since it is larger than the sum of its proper divisors (54542493).

61220115 is a wasteful number, since it uses less digits than its factorization.

61220115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123699 (or 123696 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 61220115 is about 7824.3284056844. The cubic root of 61220115 is about 394.1226374057.

It can be divided in two parts, 612201 and 15, that added together give a palindrome (612216).

The spelling of 61220115 in words is "sixty-one million, two hundred twenty thousand, one hundred fifteen".