31528069091 has 2 divisors, whose sum is σ = 31528069092. Its totient is φ = 31528069090.

The previous prime is 31528069021. The next prime is 31528069123. The reversal of 31528069091 is 19096082513.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31528069091 is a prime.

It is not a weakly prime, because it can be changed into another prime (31528069021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15764034545 + 15764034546.

It is an arithmetic number, because the mean of its divisors is an integer number (15764034546).

Almost surely, 2^31528069091 is an apocalyptic number.

31528069091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31528069091 is an equidigital number, since it uses as much as digits as its factorization.

31528069091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 44.

The spelling of 31528069091 in words is "thirty-one billion, five hundred twenty-eight million, sixty-nine thousand, ninety-one".