61415321 has 4 divisors (see below), whose sum is σ = 66998544. Its totient is φ = 55832100.

The previous prime is 61415273. The next prime is 61415327. The reversal of 61415321 is 12351416.

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 a de Polignac number, because none of the positive numbers 2^k-61415321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61415327) 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, 2791595 + ... + 2791616.

It is an arithmetic number, because the mean of its divisors is an integer number (16749636).

Almost surely, 2^61415321 is an apocalyptic number.

It is an amenable number.

61415321 is a deficient number, since it is larger than the sum of its proper divisors (5583223).

61415321 is a wasteful number, since it uses less digits than its factorization.

61415321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5583222.

The product of its digits is 720, while the sum is 23.

The square root of 61415321 is about 7836.7927751090. The cubic root of 61415321 is about 394.5410917898.

Adding to 61415321 its reverse (12351416), we get a palindrome (73766737).

The spelling of 61415321 in words is "sixty-one million, four hundred fifteen thousand, three hundred twenty-one".