981480821 has 2 divisors, whose sum is σ = 981480822. Its totient is φ = 981480820.

The previous prime is 981480811. The next prime is 981480881. The reversal of 981480821 is 128084189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 580279921 + 401200900 = 24089^2 + 20030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981480821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981480811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490740410 + 490740411.

It is an arithmetic number, because the mean of its divisors is an integer number (490740411).

Almost surely, 2^981480821 is an apocalyptic number.

It is an amenable number.

981480821 is a deficient number, since it is larger than the sum of its proper divisors (1).

981480821 is an equidigital number, since it uses as much as digits as its factorization.

981480821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 41.

The square root of 981480821 is about 31328.5943029687. The cubic root of 981480821 is about 993.7884367027.

The spelling of 981480821 in words is "nine hundred eighty-one million, four hundred eighty thousand, eight hundred twenty-one".