49137145561 has 9 divisors (see below), whose sum is σ = 57161341749. Its totient is φ = 42116223324.

The previous prime is 49137145531. The next prime is 49137145591. The reversal of 49137145561 is 16554173194.

The square root of 49137145561 is 221669.

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

It is an interprime number because it is at equal distance from previous prime (49137145531) and next prime (49137145591).

It is not a de Polignac number, because 49137145561 - 2¹¹ = 49137143513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49137145501) 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, 1535850 + ... + 1567516.

Almost surely, 2^49137145561 is an apocalyptic number.

49137145561 is the 221669-th square number.

49137145561 is the 110835-th centered octagonal number.

It is an amenable number.

49137145561 is a deficient number, since it is larger than the sum of its proper divisors (8024196188).

49137145561 is an frugal number, since it uses more digits than its factorization.

49137145561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63348 (or 31674 counting only the distinct ones).

The product of its digits is 453600, while the sum is 46.

The spelling of 49137145561 in words is "forty-nine billion, one hundred thirty-seven million, one hundred forty-five thousand, five hundred sixty-one".