4951921 has 4 divisors (see below), whose sum is σ = 5332852. Its totient is φ = 4570992.

The previous prime is 4951907. The next prime is 4951943. The reversal of 4951921 is 1291594.

4951921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 790321 + 4161600 = 889^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 4951921 - 2⁹ = 4951409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4951901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190446 + ... + 190471.

It is an arithmetic number, because the mean of its divisors is an integer number (1333213).

Almost surely, 2^4951921 is an apocalyptic number.

It is an amenable number.

4951921 is a deficient number, since it is larger than the sum of its proper divisors (380931).

4951921 is a wasteful number, since it uses less digits than its factorization.

4951921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380930.

The product of its digits is 3240, while the sum is 31.

The square root of 4951921 is about 2225.2912168972. The cubic root of 4951921 is about 170.4477355480.

The spelling of 4951921 in words is "four million, nine hundred fifty-one thousand, nine hundred twenty-one".