61494721 has 2 divisors, whose sum is σ = 61494722. Its totient is φ = 61494720.

The previous prime is 61494701. The next prime is 61494737. The reversal of 61494721 is 12749416.

61494721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58308496 + 3186225 = 7636^2 + 1785^2 .

It is a cyclic number.

It is not a de Polignac number, because 61494721 - 2¹⁹ = 60970433 is a prime.

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

It is equal to p_3645493 and since 61494721 and 3645493 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (61494701) 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 as a sum of consecutive naturals, namely, 30747360 + 30747361.

It is an arithmetic number, because the mean of its divisors is an integer number (30747361).

Almost surely, 2^61494721 is an apocalyptic number.

It is an amenable number.

61494721 is a deficient number, since it is larger than the sum of its proper divisors (1).

61494721 is an equidigital number, since it uses as much as digits as its factorization.

61494721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 61494721 is about 7841.8569867092. The cubic root of 61494721 is about 394.7110443457.

The spelling of 61494721 in words is "sixty-one million, four hundred ninety-four thousand, seven hundred twenty-one".