39209479481 has 4 divisors (see below), whose sum is σ = 39472630500. Its totient is φ = 38946328464.

The previous prime is 39209479433. The next prime is 39209479483. The reversal of 39209479481 is 18497490293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18497490293 = 733 ⋅25235321.

It can be written as a sum of positive squares in 2 ways, for example, as 6578669881 + 32630809600 = 81109^2 + 180640^2 .

It is a cyclic number.

It is not a de Polignac number, because 39209479481 - 2¹⁸ = 39209217337 is a prime.

It is a super-2 number, since 2×39209479481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39209479483) 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, 131575286 + ... + 131575583.

It is an arithmetic number, because the mean of its divisors is an integer number (9868157625).

Almost surely, 2^39209479481 is an apocalyptic number.

It is an amenable number.

39209479481 is a deficient number, since it is larger than the sum of its proper divisors (263151019).

39209479481 is a wasteful number, since it uses less digits than its factorization.

39209479481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263151018.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 39209479481 in words is "thirty-nine billion, two hundred nine million, four hundred seventy-nine thousand, four hundred eighty-one".