465371981 has 4 divisors (see below), whose sum is σ = 466568700. Its totient is φ = 464175264.

The previous prime is 465371947. The next prime is 465371983. The reversal of 465371981 is 189173564.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 276556900 + 188815081 = 16630^2 + 13741^2 .

It is a cyclic number.

It is not a de Polignac number, because 465371981 - 2⁶ = 465371917 is a prime.

It is a super-2 number, since 2×465371981² = 433142161399728722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (465371983) 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, 597776 + ... + 598553.

It is an arithmetic number, because the mean of its divisors is an integer number (116642175).

Almost surely, 2^465371981 is an apocalyptic number.

It is an amenable number.

465371981 is a deficient number, since it is larger than the sum of its proper divisors (1196719).

465371981 is a wasteful number, since it uses less digits than its factorization.

465371981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196718.

The product of its digits is 181440, while the sum is 44.

The square root of 465371981 is about 21572.4820315141. The cubic root of 465371981 is about 774.9376188430.

The spelling of 465371981 in words is "four hundred sixty-five million, three hundred seventy-one thousand, nine hundred eighty-one".