91000000010 has 32 divisors (see below), whose sum is σ = 169337310912. Its totient is φ = 35186941440.

The previous prime is 90999999973. The next prime is 91000000037. The reversal of 91000000010 is 1000000019.

It is a junction number, because it is equal to n+sod(n) for n = 90999999928 and 91000000000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1049156 + ... + 1132575.

It is an arithmetic number, because the mean of its divisors is an integer number (5291790966).

Almost surely, 2^91000000010 is an apocalyptic number.

91000000010 is a deficient number, since it is larger than the sum of its proper divisors (78337310902).

91000000010 is a wasteful number, since it uses less digits than its factorization.

91000000010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181878.

The product of its (nonzero) digits is 9, while the sum is 11.

Adding to 91000000010 its reverse (1000000019), we get a palindrome (92000000029).

The spelling of 91000000010 in words is "ninety-one billion, ten", and thus it is an aban number and an uban number.