61056927409 has 9 divisors (see below), whose sum is σ = 61681179513. Its totient is φ = 60438937812.

The previous prime is 61056927403. The next prime is 61056927413. The reversal of 61056927409 is 90472965016.

It is a happy number.

The square root of 61056927409 is 247097.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 61056927409 - 2²¹ = 61054830257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61056927403) 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 in 8 ways as a sum of consecutive naturals, for example, 25449792 + ... + 25452190.

Almost surely, 2^61056927409 is an apocalyptic number.

61056927409 is the 247097-th square number.

61056927409 is the 123549-th centered octagonal number.

It is an amenable number.

61056927409 is a deficient number, since it is larger than the sum of its proper divisors (624252104).

61056927409 is an frugal number, since it uses more digits than its factorization.

61056927409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5004 (or 2502 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 49.

Multiplying 61056927409 by its sum of digits (49), we get a square (2991789443041 = 1729679²).

The spelling of 61056927409 in words is "sixty-one billion, fifty-six million, nine hundred twenty-seven thousand, four hundred nine".