981653599 has 2 divisors, whose sum is σ = 981653600. Its totient is φ = 981653598.

The previous prime is 981653591. The next prime is 981653653. The reversal of 981653599 is 995356189.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981653599 - 2³ = 981653591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981653591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490826799 + 490826800.

It is an arithmetic number, because the mean of its divisors is an integer number (490826800).

Almost surely, 2^981653599 is an apocalyptic number.

981653599 is a deficient number, since it is larger than the sum of its proper divisors (1).

981653599 is an equidigital number, since it uses as much as digits as its factorization.

981653599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2624400, while the sum is 55.

The square root of 981653599 is about 31331.3516944290. The cubic root of 981653599 is about 993.8467481509.

The spelling of 981653599 in words is "nine hundred eighty-one million, six hundred fifty-three thousand, five hundred ninety-nine".