61421897 has 2 divisors, whose sum is σ = 61421898. Its totient is φ = 61421896.

The previous prime is 61421863. The next prime is 61421911. The reversal of 61421897 is 79812416.

61421897 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., 47665216 + 13756681 = 6904^2 + 3709^2 .

It is a cyclic number.

It is not a de Polignac number, because 61421897 - 2⁸ = 61421641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61421897.

It is not a weakly prime, because it can be changed into another prime (61421197) 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, 30710948 + 30710949.

It is an arithmetic number, because the mean of its divisors is an integer number (30710949).

Almost surely, 2^61421897 is an apocalyptic number.

It is an amenable number.

61421897 is a deficient number, since it is larger than the sum of its proper divisors (1).

61421897 is an equidigital number, since it uses as much as digits as its factorization.

61421897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 61421897 is about 7837.2123232690. The cubic root of 61421897 is about 394.5551730189. Note that the first 3 decimals are identical.

The spelling of 61421897 in words is "sixty-one million, four hundred twenty-one thousand, eight hundred ninety-seven".