61621633 has 2 divisors, whose sum is σ = 61621634. Its totient is φ = 61621632.

The previous prime is 61621627. The next prime is 61621639. The reversal of 61621633 is 33612616.

It is a balanced prime because it is at equal distance from previous prime (61621627) and next prime (61621639).

It can be written as a sum of positive squares in only one way, i.e., 57410929 + 4210704 = 7577^2 + 2052^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61621633 is a prime.

It is not a weakly prime, because it can be changed into another prime (61621639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30810816 + 30810817.

It is an arithmetic number, because the mean of its divisors is an integer number (30810817).

Almost surely, 2^61621633 is an apocalyptic number.

It is an amenable number.

61621633 is a deficient number, since it is larger than the sum of its proper divisors (1).

61621633 is an equidigital number, since it uses as much as digits as its factorization.

61621633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

The square root of 61621633 is about 7849.9447768758. The cubic root of 61621633 is about 394.9823909257.

The spelling of 61621633 in words is "sixty-one million, six hundred twenty-one thousand, six hundred thirty-three".