49921281 has 12 divisors (see below), whose sum is σ = 72182500. Its totient is φ = 33246720.

The previous prime is 49921271. The next prime is 49921297. The reversal of 49921281 is 18212994.

It can be written as a sum of positive squares in 2 ways, for example, as 19847025 + 30074256 = 4455^2 + 5484^2 .

It is not a de Polignac number, because 49921281 - 2¹⁰ = 49920257 is a prime.

It is a super-2 number, since 2×49921281² = 4984268593361922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49921211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9021 + ... + 13461.

Almost surely, 2^49921281 is an apocalyptic number.

It is an amenable number.

49921281 is a deficient number, since it is larger than the sum of its proper divisors (22261219).

49921281 is a wasteful number, since it uses less digits than its factorization.

49921281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5696 (or 5693 counting only the distinct ones).

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

The square root of 49921281 is about 7065.4993454108. The cubic root of 49921281 is about 368.2097127970.

It can be divided in two parts, 4 and 9921281, that added together give a triangular number (9921285 = T₄₄₅₄).

The spelling of 49921281 in words is "forty-nine million, nine hundred twenty-one thousand, two hundred eighty-one".