31661430541 has 4 divisors (see below), whose sum is σ = 34096925212. Its totient is φ = 29225935872.

The previous prime is 31661430529. The next prime is 31661430553. The reversal of 31661430541 is 14503416613.

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

It is an interprime number because it is at equal distance from previous prime (31661430529) and next prime (31661430553).

It can be written as a sum of positive squares in 2 ways, for example, as 12514896900 + 19146533641 = 111870^2 + 138371^2 .

It is a cyclic number.

It is not a de Polignac number, because 31661430541 - 2³³ = 23071495949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31661430497 and 31661430506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661430641) 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, 1217747316 + ... + 1217747341.

It is an arithmetic number, because the mean of its divisors is an integer number (8524231303).

Almost surely, 2^31661430541 is an apocalyptic number.

It is an amenable number.

31661430541 is a deficient number, since it is larger than the sum of its proper divisors (2435494671).

31661430541 is a wasteful number, since it uses less digits than its factorization.

31661430541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435494670.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 31661430541 in words is "thirty-one billion, six hundred sixty-one million, four hundred thirty thousand, five hundred forty-one".