61340621 has 4 divisors (see below), whose sum is σ = 61611072. Its totient is φ = 61070172.

The previous prime is 61340567. The next prime is 61340623. The reversal of 61340621 is 12604316.

It is a happy number.

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-61340621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61340623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134885 + ... + 135338.

It is an arithmetic number, because the mean of its divisors is an integer number (15402768).

Almost surely, 2^61340621 is an apocalyptic number.

It is an amenable number.

61340621 is a deficient number, since it is larger than the sum of its proper divisors (270451).

61340621 is a wasteful number, since it uses less digits than its factorization.

61340621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270450.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 61340621 is about 7832.0253446985. The cubic root of 61340621 is about 394.3810656146.

Adding to 61340621 its reverse (12604316), we get a palindrome (73944937).

The spelling of 61340621 in words is "sixty-one million, three hundred forty thousand, six hundred twenty-one".