61061621 has 2 divisors, whose sum is σ = 61061622. Its totient is φ = 61061620.

The previous prime is 61061579. The next prime is 61061629. The reversal of 61061621 is 12616016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61058596 + 3025 = 7814^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 61061621 - 2¹⁸ = 60799477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61061629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30530810 + 30530811.

It is an arithmetic number, because the mean of its divisors is an integer number (30530811).

Almost surely, 2^61061621 is an apocalyptic number.

It is an amenable number.

61061621 is a deficient number, since it is larger than the sum of its proper divisors (1).

61061621 is an equidigital number, since it uses as much as digits as its factorization.

61061621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 61061621 is about 7814.1935604386. The cubic root of 61061621 is about 393.7822261018.

Adding to 61061621 its reverse (12616016), we get a palindrome (73677637).

The spelling of 61061621 in words is "sixty-one million, sixty-one thousand, six hundred twenty-one".