49981221 has 6 divisors (see below), whose sum is σ = 72195110. Its totient is φ = 33320808.

The previous prime is 49981219. The next prime is 49981237. The reversal of 49981221 is 12218994.

It can be written as a sum of positive squares in only one way, i.e., 44076321 + 5904900 = 6639^2 + 2430^2 .

It is not a de Polignac number, because 49981221 - 2¹ = 49981219 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 (49981271) 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, 2776726 + ... + 2776743.

Almost surely, 2^49981221 is an apocalyptic number.

It is an amenable number.

49981221 is a deficient number, since it is larger than the sum of its proper divisors (22213889).

49981221 is a wasteful number, since it uses less digits than its factorization.

49981221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5553475 (or 5553472 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 49981221 is about 7069.7398113368. The cubic root of 49981221 is about 368.3570224704.

The spelling of 49981221 in words is "forty-nine million, nine hundred eighty-one thousand, two hundred twenty-one".