97991142 has 16 divisors (see below), whose sum is σ = 196190832. Its totient is φ = 32628960.

The previous prime is 97991141. The next prime is 97991171. The reversal of 97991142 is 24119979.

It is a junction number, because it is equal to n+sod(n) for n = 97991094 and 97991103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97991141) by changing a digit.

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, 2209 + ... + 14172.

It is an arithmetic number, because the mean of its divisors is an integer number (12261927).

Almost surely, 2^97991142 is an apocalyptic number.

97991142 is an abundant number, since it is smaller than the sum of its proper divisors (98199690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

97991142 is a wasteful number, since it uses less digits than its factorization.

97991142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17383.

The product of its digits is 40824, while the sum is 42.

The square root of 97991142 is about 9899.0475299394. The cubic root of 97991142 is about 461.0297378878.

The spelling of 97991142 in words is "ninety-seven million, nine hundred ninety-one thousand, one hundred forty-two".