981478577 has 2 divisors, whose sum is σ = 981478578. Its totient is φ = 981478576.

The previous prime is 981478571. The next prime is 981478621. The reversal of 981478577 is 775874189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 902641936 + 78836641 = 30044^2 + 8879^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981478577 is a prime.

It is not a weakly prime, because it can be changed into another prime (981478571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490739288 + 490739289.

It is an arithmetic number, because the mean of its divisors is an integer number (490739289).

Almost surely, 2^981478577 is an apocalyptic number.

It is an amenable number.

981478577 is a deficient number, since it is larger than the sum of its proper divisors (1).

981478577 is an equidigital number, since it uses as much as digits as its factorization.

981478577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3951360, while the sum is 56.

The square root of 981478577 is about 31328.5584890208. The cubic root of 981478577 is about 993.7876793223.

The spelling of 981478577 in words is "nine hundred eighty-one million, four hundred seventy-eight thousand, five hundred seventy-seven".