61620539 has 2 divisors, whose sum is σ = 61620540. Its totient is φ = 61620538.

The previous prime is 61620497. The next prime is 61620547. The reversal of 61620539 is 93502616.

It is a happy number.

61620539 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61620539 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61620239) 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, 30810269 + 30810270.

It is an arithmetic number, because the mean of its divisors is an integer number (30810270).

Almost surely, 2^61620539 is an apocalyptic number.

61620539 is a deficient number, since it is larger than the sum of its proper divisors (1).

61620539 is an equidigital number, since it uses as much as digits as its factorization.

61620539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 61620539 is about 7849.8750945477. The cubic root of 61620539 is about 394.9800534712.

The spelling of 61620539 in words is "sixty-one million, six hundred twenty thousand, five hundred thirty-nine".