49431073561 has 9 divisors (see below), whose sum is σ = 49703584671. Its totient is φ = 49160052072.

The previous prime is 49431073537. The next prime is 49431073567. The reversal of 49431073561 is 16537013494.

The square root of 49431073561 is 222331.

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

It can be written as a sum of positive squares in only one way, i.e., 42549375625 + 6881697936 = 206275^2 + 82956^2 .

It is not a de Polignac number, because 49431073561 - 2²⁹ = 48894202649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49431073567) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 49579315 + ... + 49580311.

It is an arithmetic number, because the mean of its divisors is an integer number (5522620519).

Almost surely, 2^49431073561 is an apocalyptic number.

49431073561 is the 222331-st square number.

49431073561 is the 111166-th centered octagonal number.

It is an amenable number.

49431073561 is a deficient number, since it is larger than the sum of its proper divisors (272511110).

49431073561 is an frugal number, since it uses more digits than its factorization.

49431073561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440 (or 1220 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 49431073561 in words is "forty-nine billion, four hundred thirty-one million, seventy-three thousand, five hundred sixty-one".