61288321 has 4 divisors (see below), whose sum is σ = 61345792. Its totient is φ = 61230852.

The previous prime is 61288309. The next prime is 61288343. The reversal of 61288321 is 12388216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61288321 - 2¹³ = 61280129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61288301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27105 + ... + 29278.

It is an arithmetic number, because the mean of its divisors is an integer number (15336448).

Almost surely, 2^61288321 is an apocalyptic number.

It is an amenable number.

61288321 is a deficient number, since it is larger than the sum of its proper divisors (57471).

61288321 is a wasteful number, since it uses less digits than its factorization.

61288321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57470.

The product of its digits is 4608, while the sum is 31.

The square root of 61288321 is about 7828.6857773192. The cubic root of 61288321 is about 394.2689485312.

The spelling of 61288321 in words is "sixty-one million, two hundred eighty-eight thousand, three hundred twenty-one".