51490819 has 4 divisors (see below), whose sum is σ = 51818944. Its totient is φ = 51162696.

The previous prime is 51490811. The next prime is 51490843. The reversal of 51490819 is 91809415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91809415 = 5 ⋅18361883.

It is a cyclic number.

It is not a de Polignac number, because 51490819 - 2³ = 51490811 is a prime.

It is a super-2 number, since 2×51490819² = 5302608882581522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51490811) 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, 163827 + ... + 164140.

It is an arithmetic number, because the mean of its divisors is an integer number (12954736).

Almost surely, 2^51490819 is an apocalyptic number.

51490819 is a deficient number, since it is larger than the sum of its proper divisors (328125).

51490819 is a wasteful number, since it uses less digits than its factorization.

51490819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328124.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 51490819 is about 7175.7103481119. The cubic root of 51490819 is about 372.0288329870.

The spelling of 51490819 in words is "fifty-one million, four hundred ninety thousand, eight hundred nineteen".