959387981 has 4 divisors (see below), whose sum is σ = 959580732. Its totient is φ = 959195232.

The previous prime is 959387971. The next prime is 959387993. The reversal of 959387981 is 189783959.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189783959 = 1483 ⋅127973.

It can be written as a sum of positive squares in 2 ways, for example, as 203632900 + 755755081 = 14270^2 + 27491^2 .

It is a cyclic number.

It is not a de Polignac number, because 959387981 - 2¹⁴ = 959371597 is a prime.

It is a super-2 number, since 2×959387981² = 1840850596174512722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 959387981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (959387951) 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, 88706 + ... + 98931.

It is an arithmetic number, because the mean of its divisors is an integer number (239895183).

Almost surely, 2^959387981 is an apocalyptic number.

It is an amenable number.

959387981 is a deficient number, since it is larger than the sum of its proper divisors (192751).

959387981 is a wasteful number, since it uses less digits than its factorization.

959387981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192750.

The product of its digits is 4898880, while the sum is 59.

The square root of 959387981 is about 30973.9887809110. The cubic root of 959387981 is about 986.2751506333.

The spelling of 959387981 in words is "nine hundred fifty-nine million, three hundred eighty-seven thousand, nine hundred eighty-one".