61221445 has 8 divisors (see below), whose sum is σ = 74396160. Its totient is φ = 48356880.

The previous prime is 61221443. The next prime is 61221463. The reversal of 61221445 is 54412216.

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 61221445 - 2¹ = 61221443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61221443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77101 + ... + 77890.

It is an arithmetic number, because the mean of its divisors is an integer number (9299520).

Almost surely, 2^61221445 is an apocalyptic number.

It is an amenable number.

61221445 is a deficient number, since it is larger than the sum of its proper divisors (13174715).

61221445 is a wasteful number, since it uses less digits than its factorization.

61221445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155075.

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

The square root of 61221445 is about 7824.4133965429. The cubic root of 61221445 is about 394.1254914748.

The spelling of 61221445 in words is "sixty-one million, two hundred twenty-one thousand, four hundred forty-five".