61221375 has 24 divisors (see below), whose sum is σ = 110363760. Its totient is φ = 32650800.

The previous prime is 61221371. The next prime is 61221389. The reversal of 61221375 is 57312216.

It is a happy number.

It is not a de Polignac number, because 61221375 - 2² = 61221371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61221371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26085 + ... + 28334.

It is an arithmetic number, because the mean of its divisors is an integer number (4598490).

Almost surely, 2^61221375 is an apocalyptic number.

61221375 is a deficient number, since it is larger than the sum of its proper divisors (49142385).

61221375 is a wasteful number, since it uses less digits than its factorization.

61221375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54440 (or 54427 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 61221375 is about 7824.4089233628. The cubic root of 61221375 is about 394.1253412617.

The spelling of 61221375 in words is "sixty-one million, two hundred twenty-one thousand, three hundred seventy-five".