49481721 has 6 divisors (see below), whose sum is σ = 71473610. Its totient is φ = 32987808.

The previous prime is 49481669. The next prime is 49481759. The reversal of 49481721 is 12718494.

It can be written as a sum of positive squares in only one way, i.e., 34574400 + 14907321 = 5880^2 + 3861^2 .

It is not a de Polignac number, because 49481721 - 2⁶ = 49481657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49481791) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2748976 + ... + 2748993.

Almost surely, 2^49481721 is an apocalyptic number.

It is an amenable number.

49481721 is a deficient number, since it is larger than the sum of its proper divisors (21991889).

49481721 is a wasteful number, since it uses less digits than its factorization.

49481721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5497975 (or 5497972 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 49481721 is about 7034.3244878240. The cubic root of 49481721 is about 367.1258221232.

It can be divided in two parts, 494 and 81721, that added together give a triangular number (82215 = T₄₀₅).

The spelling of 49481721 in words is "forty-nine million, four hundred eighty-one thousand, seven hundred twenty-one".