61621061 has 2 divisors, whose sum is σ = 61621062. Its totient is φ = 61621060.

The previous prime is 61621057. The next prime is 61621081. The reversal of 61621061 is 16012616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57988225 + 3632836 = 7615^2 + 1906^2 .

It is a cyclic number.

It is not a de Polignac number, because 61621061 - 2² = 61621057 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61621081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30810530 + 30810531.

It is an arithmetic number, because the mean of its divisors is an integer number (30810531).

Almost surely, 2^61621061 is an apocalyptic number.

It is an amenable number.

61621061 is a deficient number, since it is larger than the sum of its proper divisors (1).

61621061 is an equidigital number, since it uses as much as digits as its factorization.

61621061 is an evil number, because the sum of its binary digits is even.

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

The square root of 61621061 is about 7849.9083434140. The cubic root of 61621061 is about 394.9811687866.

Adding to 61621061 its reverse (16012616), we get a palindrome (77633677).

The spelling of 61621061 in words is "sixty-one million, six hundred twenty-one thousand, sixty-one".