31123432061 has 2 divisors, whose sum is σ = 31123432062. Its totient is φ = 31123432060.

The previous prime is 31123432027. The next prime is 31123432103. The reversal of 31123432061 is 16023432113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24164702500 + 6958729561 = 155450^2 + 83419^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123432061 - 2²² = 31119237757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31123432061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31123435061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561716030 + 15561716031.

It is an arithmetic number, because the mean of its divisors is an integer number (15561716031).

Almost surely, 2^31123432061 is an apocalyptic number.

It is an amenable number.

31123432061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123432061 is an equidigital number, since it uses as much as digits as its factorization.

31123432061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 31123432061 its reverse (16023432113), we get a palindrome (47146864174).

The spelling of 31123432061 in words is "thirty-one billion, one hundred twenty-three million, four hundred thirty-two thousand, sixty-one".