49208992561 has 3 divisors (see below), whose sum is σ = 49209214393. Its totient is φ = 49208770730.

The previous prime is 49208992559. The next prime is 49208992603. The reversal of 49208992561 is 16529980294.

The square root of 49208992561 is 221831.

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

49208992561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 49208992561 - 2¹ = 49208992559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49208992541) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 110916 + ... + 332746.

Almost surely, 2^49208992561 is an apocalyptic number.

49208992561 is the 221831-st square number.

49208992561 is the 110916-th centered octagonal number.

It is an amenable number.

49208992561 is a deficient number, since it is larger than the sum of its proper divisors (221832).

49208992561 is an frugal number, since it uses more digits than its factorization.

49208992561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443662 (or 221831 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 49208992561 in words is "forty-nine billion, two hundred eight million, nine hundred ninety-two thousand, five hundred sixty-one".