39971613461 has 8 divisors (see below), whose sum is σ = 43050617400. Its totient is φ = 36893218752.

The previous prime is 39971613439. The next prime is 39971613469. The reversal of 39971613461 is 16431617993.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 700660900 + 39270952561 = 26470^2 + 198169^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39971613461 - 2²² = 39967419157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39971613469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11186 + ... + 282963.

It is an arithmetic number, because the mean of its divisors is an integer number (5381327175).

Almost surely, 2^39971613461 is an apocalyptic number.

It is an amenable number.

39971613461 is a deficient number, since it is larger than the sum of its proper divisors (3079003939).

39971613461 is a wasteful number, since it uses less digits than its factorization.

39971613461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304615.

The product of its digits is 734832, while the sum is 50.

The spelling of 39971613461 in words is "thirty-nine billion, nine hundred seventy-one million, six hundred thirteen thousand, four hundred sixty-one".