61442215 has 4 divisors (see below), whose sum is σ = 73730664. Its totient is φ = 49153768.

The previous prime is 61442209. The next prime is 61442243. The reversal of 61442215 is 51224416.

It is a happy number.

61442215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61442215 - 2⁹ = 61441703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61442215.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6144217 + ... + 6144226.

It is an arithmetic number, because the mean of its divisors is an integer number (18432666).

Almost surely, 2^61442215 is an apocalyptic number.

61442215 is a deficient number, since it is larger than the sum of its proper divisors (12288449).

61442215 is a wasteful number, since it uses less digits than its factorization.

61442215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12288448.

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

The square root of 61442215 is about 7838.5084678145. The cubic root of 61442215 is about 394.5986737280.

The spelling of 61442215 in words is "sixty-one million, four hundred forty-two thousand, two hundred fifteen".