61016921 has 4 divisors (see below), whose sum is σ = 69733632. Its totient is φ = 52300212.

The previous prime is 61016911. The next prime is 61016933. The reversal of 61016921 is 12961016.

61016921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-61016921 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61016911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4358345 + ... + 4358358.

It is an arithmetic number, because the mean of its divisors is an integer number (17433408).

Almost surely, 2^61016921 is an apocalyptic number.

It is an amenable number.

61016921 is a deficient number, since it is larger than the sum of its proper divisors (8716711).

61016921 is an equidigital number, since it uses as much as digits as its factorization.

61016921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8716710.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 61016921 is about 7811.3328568177. The cubic root of 61016921 is about 393.6861135620.

Adding to 61016921 its reverse (12961016), we get a palindrome (73977937).

The spelling of 61016921 in words is "sixty-one million, sixteen thousand, nine hundred twenty-one".