49151921 has 16 divisors (see below), whose sum is σ = 60985344. Its totient is φ = 38574144.

The previous prime is 49151911. The next prime is 49151933. The reversal of 49151921 is 12915194.

It is not a de Polignac number, because 49151921 - 2⁶ = 49151857 is a prime.

It is a super-2 number, since 2×49151921² = 4831822675980482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (49151911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9431 + ... + 13683.

It is an arithmetic number, because the mean of its divisors is an integer number (3811584).

Almost surely, 2^49151921 is an apocalyptic number.

It is an amenable number.

49151921 is a deficient number, since it is larger than the sum of its proper divisors (11833423).

49151921 is a wasteful number, since it uses less digits than its factorization.

49151921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400.

The product of its digits is 3240, while the sum is 32.

The square root of 49151921 is about 7010.8431019386. The cubic root of 49151921 is about 366.3083613660.

The spelling of 49151921 in words is "forty-nine million, one hundred fifty-one thousand, nine hundred twenty-one".