61996921 has 4 divisors (see below), whose sum is σ = 70853632. Its totient is φ = 53140212.

The previous prime is 61996903. The next prime is 61996951. The reversal of 61996921 is 12969916.

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 61996921 - 2⁵ = 61996889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61996951) 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, 4428345 + ... + 4428358.

It is an arithmetic number, because the mean of its divisors is an integer number (17713408).

Almost surely, 2^61996921 is an apocalyptic number.

It is an amenable number.

61996921 is a deficient number, since it is larger than the sum of its proper divisors (8856711).

61996921 is an equidigital number, since it uses as much as digits as its factorization.

61996921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8856710.

The product of its digits is 52488, while the sum is 43.

The square root of 61996921 is about 7873.8123548888. The cubic root of 61996921 is about 395.7826090594.

The spelling of 61996921 in words is "sixty-one million, nine hundred ninety-six thousand, nine hundred twenty-one".