90910929291 has 64 divisors (see below), whose sum is σ = 162232455168. Its totient is φ = 43912378368.

The previous prime is 90910929287. The next prime is 90910929301. The reversal of 90910929291 is 19292901909.

It is not a de Polignac number, because 90910929291 - 2² = 90910929287 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (90910921291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 92995 + ... + 436428.

It is an arithmetic number, because the mean of its divisors is an integer number (2534882112).

Almost surely, 2^90910929291 is an apocalyptic number.

90910929291 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

90910929291 is a deficient number, since it is larger than the sum of its proper divisors (71321525877).

90910929291 is a wasteful number, since it uses less digits than its factorization.

90910929291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529500.

The product of its (nonzero) digits is 236196, while the sum is 51.

It can be divided in two parts, 90910 and 929291, that added together give a palindrome (1020201).

The spelling of 90910929291 in words is "ninety billion, nine hundred ten million, nine hundred twenty-nine thousand, two hundred ninety-one".