485711981 has 24 divisors (see below), whose sum is σ = 543524904. Its totient is φ = 432373760.

The previous prime is 485711969. The next prime is 485711983. The reversal of 485711981 is 189117584.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 7896100 + 477815881 = 2810^2 + 21859^2 .

It is not a de Polignac number, because 485711981 - 2¹⁰ = 485710957 is a prime.

It is a super-2 number, since 2×485711981² = 471832256973888722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (485711983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 757421 + ... + 758061.

It is an arithmetic number, because the mean of its divisors is an integer number (22646871).

Almost surely, 2^485711981 is an apocalyptic number.

It is an amenable number.

485711981 is a deficient number, since it is larger than the sum of its proper divisors (57812923).

485711981 is a wasteful number, since it uses less digits than its factorization.

485711981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769 (or 740 counting only the distinct ones).

The product of its digits is 80640, while the sum is 44.

The square root of 485711981 is about 22038.8743133582. The cubic root of 485711981 is about 786.0670741319.

The spelling of 485711981 in words is "four hundred eighty-five million, seven hundred eleven thousand, nine hundred eighty-one".