49969921 has 4 divisors (see below), whose sum is σ = 50052052. Its totient is φ = 49887792.

The previous prime is 49969903. The next prime is 49969951. The reversal of 49969921 is 12996994.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12996994 = 2 ⋅6498497.

It can be written as a sum of positive squares in 2 ways, for example, as 408321 + 49561600 = 639^2 + 7040^2 .

It is a cyclic number.

It is not a de Polignac number, because 49969921 - 2⁵ = 49969889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49969951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40146 + ... + 41371.

It is an arithmetic number, because the mean of its divisors is an integer number (12513013).

Almost surely, 2^49969921 is an apocalyptic number.

It is an amenable number.

49969921 is a deficient number, since it is larger than the sum of its proper divisors (82131).

49969921 is an equidigital number, since it uses as much as digits as its factorization.

49969921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82130.

The product of its digits is 314928, while the sum is 49.

The square root of 49969921 is about 7068.9405854060. The cubic root of 49969921 is about 368.3292603896.

The spelling of 49969921 in words is "forty-nine million, nine hundred sixty-nine thousand, nine hundred twenty-one".