61487779 has 2 divisors, whose sum is σ = 61487780. Its totient is φ = 61487778.

The previous prime is 61487773. The next prime is 61487813. The reversal of 61487779 is 97778416.

61487779 is nontrivially palindromic in base 16.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61487779 - 2³ = 61487771 is a prime.

It is not a weakly prime, because it can be changed into another prime (61487771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30743889 + 30743890.

It is an arithmetic number, because the mean of its divisors is an integer number (30743890).

Almost surely, 2^61487779 is an apocalyptic number.

61487779 is a deficient number, since it is larger than the sum of its proper divisors (1).

61487779 is an equidigital number, since it uses as much as digits as its factorization.

61487779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 49.

The square root of 61487779 is about 7841.4143494653. The cubic root of 61487779 is about 394.6961911077.

The spelling of 61487779 in words is "sixty-one million, four hundred eighty-seven thousand, seven hundred seventy-nine".