49561000129 has 9 divisors (see below), whose sum is σ = 52311226467. Its totient is φ = 46948519224.

The previous prime is 49561000123. The next prime is 49561000141. The reversal of 49561000129 is 92100016594.

The square root of 49561000129 is 222623.

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., 211266225 + 49349733904 = 14535^2 + 222148^2 .

It is not a de Polignac number, because 49561000129 - 2⁹ = 49560999617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49561000123) 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, 4223979 + ... + 4235695.

Almost surely, 2^49561000129 is an apocalyptic number.

49561000129 is the 222623-rd square number.

49561000129 is the 111312-nd centered octagonal number.

It is an amenable number.

49561000129 is a deficient number, since it is larger than the sum of its proper divisors (2750226338).

49561000129 is an frugal number, since it uses more digits than its factorization.

49561000129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23472 (or 11736 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 49561000129 in words is "forty-nine billion, five hundred sixty-one million, one hundred twenty-nine", and thus it is an aban number.