61820669 has 2 divisors, whose sum is σ = 61820670. Its totient is φ = 61820668.

The previous prime is 61820659. The next prime is 61820683. The reversal of 61820669 is 96602816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58323769 + 3496900 = 7637^2 + 1870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61820669 is a prime.

It is a super-2 number, since 2×61820669² = 7643590231215122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61820609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30910334 + 30910335.

It is an arithmetic number, because the mean of its divisors is an integer number (30910335).

Almost surely, 2^61820669 is an apocalyptic number.

It is an amenable number.

61820669 is a deficient number, since it is larger than the sum of its proper divisors (1).

61820669 is an equidigital number, since it uses as much as digits as its factorization.

61820669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 61820669 is about 7862.6120977701. The cubic root of 61820669 is about 395.4071942552.

The spelling of 61820669 in words is "sixty-one million, eight hundred twenty thousand, six hundred sixty-nine".