51619021 has 16 divisors (see below), whose sum is σ = 55954800. Its totient is φ = 47443968.

The previous prime is 51618989. The next prime is 51619027. The reversal of 51619021 is 12091615.

51619021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 3663396 + 47955625 = 1914^2 + 6925^2 .

It is a cyclic number.

It is not a de Polignac number, because 51619021 - 2⁵ = 51618989 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 (51619027) 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 15 ways as a sum of consecutive naturals, for example, 164761 + ... + 165073.

It is an arithmetic number, because the mean of its divisors is an integer number (3497175).

Almost surely, 2^51619021 is an apocalyptic number.

It is an amenable number.

51619021 is a deficient number, since it is larger than the sum of its proper divisors (4335779).

51619021 is a wasteful number, since it uses less digits than its factorization.

51619021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 51619021 is about 7184.6378475188. The cubic root of 51619021 is about 372.3373366027.

The spelling of 51619021 in words is "fifty-one million, six hundred nineteen thousand, twenty-one".