31542443623 has 2 divisors, whose sum is σ = 31542443624. Its totient is φ = 31542443622.

The previous prime is 31542443591. The next prime is 31542443641. The reversal of 31542443623 is 32634424513.

It is a strong prime.

It is an emirp because it is prime and its reverse (32634424513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31542443623 - 2⁵ = 31542443591 is a prime.

It is a super-2 number, since 2×31542443623² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31542443663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15771221811 + 15771221812.

It is an arithmetic number, because the mean of its divisors is an integer number (15771221812).

Almost surely, 2^31542443623 is an apocalyptic number.

31542443623 is a deficient number, since it is larger than the sum of its proper divisors (1).

31542443623 is an equidigital number, since it uses as much as digits as its factorization.

31542443623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 37.

The spelling of 31542443623 in words is "thirty-one billion, five hundred forty-two million, four hundred forty-three thousand, six hundred twenty-three".