981406593 has 6 divisors (see below), whose sum is σ = 1417587314. Its totient is φ = 654271056.

The previous prime is 981406589. The next prime is 981406607. The reversal of 981406593 is 395604189.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 624650049 + 356756544 = 24993^2 + 18888^2 .

It is not a de Polignac number, because 981406593 - 2² = 981406589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (981406513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54522580 + ... + 54522597.

Almost surely, 2^981406593 is an apocalyptic number.

It is an amenable number.

981406593 is a deficient number, since it is larger than the sum of its proper divisors (436180721).

981406593 is a wasteful number, since it uses less digits than its factorization.

981406593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109045183 (or 109045180 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 981406593 is about 31327.4096120314. The cubic root of 981406593 is about 993.7633831353.

The spelling of 981406593 in words is "nine hundred eighty-one million, four hundred six thousand, five hundred ninety-three".