91506212156 has 12 divisors (see below), whose sum is σ = 160974280320. Its totient is φ = 45513560640.

The previous prime is 91506212129. The next prime is 91506212159. The reversal of 91506212156 is 65121260519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91506212159) 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, 59885501 + ... + 59887028.

It is an arithmetic number, because the mean of its divisors is an integer number (13414523360).

Almost surely, 2^91506212156 is an apocalyptic number.

It is an amenable number.

91506212156 is a deficient number, since it is larger than the sum of its proper divisors (69468068164).

91506212156 is a wasteful number, since it uses less digits than its factorization.

91506212156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119772724 (or 119772722 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 91506212156 in words is "ninety-one billion, five hundred six million, two hundred twelve thousand, one hundred fifty-six".