61720433 has 2 divisors, whose sum is σ = 61720434. Its totient is φ = 61720432.

The previous prime is 61720427. The next prime is 61720459. The reversal of 61720433 is 33402716.

It is an a-pointer prime, because the next prime (61720459) can be obtained adding 61720433 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48052624 + 13667809 = 6932^2 + 3697^2 .

It is a cyclic number.

It is not a de Polignac number, because 61720433 - 2⁶ = 61720369 is a prime.

It is not a weakly prime, because it can be changed into another prime (61720423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30860216 + 30860217.

It is an arithmetic number, because the mean of its divisors is an integer number (30860217).

Almost surely, 2^61720433 is an apocalyptic number.

It is an amenable number.

61720433 is a deficient number, since it is larger than the sum of its proper divisors (1).

61720433 is an equidigital number, since it uses as much as digits as its factorization.

61720433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 61720433 is about 7856.2352943379. The cubic root of 61720433 is about 395.1933743125.

The spelling of 61720433 in words is "sixty-one million, seven hundred twenty thousand, four hundred thirty-three".