100642156 has 12 divisors (see below), whose sum is σ = 177940168. Its totient is φ = 49802112.

The previous prime is 100642127. The next prime is 100642163. The reversal of 100642156 is 651246001.

It is a self number, because there is not a number n which added to its sum of digits gives 100642156.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 129306 + ... + 130081.

Almost surely, 2^100642156 is an apocalyptic number.

It is an amenable number.

100642156 is a deficient number, since it is larger than the sum of its proper divisors (77298012).

100642156 is a wasteful number, since it uses less digits than its factorization.

100642156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259488 (or 259486 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 100642156 is about 10032.0564192991. The cubic root of 100642156 is about 465.1503055938.

Adding to 100642156 its reverse (651246001), we get a palindrome (751888157).

The spelling of 100642156 in words is "one hundred million, six hundred forty-two thousand, one hundred fifty-six".