51484981 has 4 divisors (see below), whose sum is σ = 52015852. Its totient is φ = 50954112.

The previous prime is 51484957. The next prime is 51484991. The reversal of 51484981 is 18948415.

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 22648081 + 28836900 = 4759^2 + 5370^2 .

It is a cyclic number.

It is not a de Polignac number, because 51484981 - 2⁵ = 51484949 is a prime.

It is a super-2 number, since 2×51484981² = 5301406537140722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51484991) 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, 265290 + ... + 265483.

It is an arithmetic number, because the mean of its divisors is an integer number (13003963).

Almost surely, 2^51484981 is an apocalyptic number.

It is an amenable number.

51484981 is a deficient number, since it is larger than the sum of its proper divisors (530871).

51484981 is an equidigital number, since it uses as much as digits as its factorization.

51484981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530870.

The product of its digits is 46080, while the sum is 40.

The square root of 51484981 is about 7175.3035475860. The cubic root of 51484981 is about 372.0147723158.

The spelling of 51484981 in words is "fifty-one million, four hundred eighty-four thousand, nine hundred eighty-one".