91980542 has 16 divisors (see below), whose sum is σ = 144584352. Its totient is φ = 43802880.

The previous prime is 91980529. The next prime is 91980563. The reversal of 91980542 is 24508919.

It is a super-2 number, since 2×91980542² = 16920840213227528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91980496 and 91980505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6938 + ... + 15234.

It is an arithmetic number, because the mean of its divisors is an integer number (9036522).

Almost surely, 2^91980542 is an apocalyptic number.

91980542 is a deficient number, since it is larger than the sum of its proper divisors (52603810).

91980542 is a wasteful number, since it uses less digits than its factorization.

91980542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8563.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 91980542 is about 9590.6486746205. The cubic root of 91980542 is about 451.4039150835.

The spelling of 91980542 in words is "ninety-one million, nine hundred eighty thousand, five hundred forty-two".