61368921 has 24 divisors (see below), whose sum is σ = 93248064. Its totient is φ = 40325040.

The previous prime is 61368919. The next prime is 61368943. The reversal of 61368921 is 12986316.

61368921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61368921 - 2¹ = 61368919 is a prime.

It is a super-2 number, since 2×61368921² = 7532288929408482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61368911) 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 23 ways as a sum of consecutive naturals, for example, 15475 + ... + 19031.

It is an arithmetic number, because the mean of its divisors is an integer number (3885336).

Almost surely, 2^61368921 is an apocalyptic number.

It is an amenable number.

61368921 is a deficient number, since it is larger than the sum of its proper divisors (31879143).

61368921 is an equidigital number, since it uses as much as digits as its factorization.

61368921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643 (or 3631 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 61368921 is about 7833.8318210184. The cubic root of 61368921 is about 394.4417066059.

The spelling of 61368921 in words is "sixty-one million, three hundred sixty-eight thousand, nine hundred twenty-one".