100642155 has 16 divisors (see below), whose sum is σ = 161420064. Its totient is φ = 53544960.

The previous prime is 100642127. The next prime is 100642163. The reversal of 100642155 is 551246001.

It is not a de Polignac number, because 100642155 - 2⁵ = 100642123 is a prime.

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, 1654 + ... + 14283.

It is an arithmetic number, because the mean of its divisors is an integer number (10088754).

Almost surely, 2^100642155 is an apocalyptic number.

100642155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

100642155 is a deficient number, since it is larger than the sum of its proper divisors (60777909).

100642155 is a wasteful number, since it uses less digits than its factorization.

100642155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16366.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 100642155 is about 10032.0563694589. The cubic root of 100642155 is about 465.1503040532.

Adding to 100642155 its reverse (551246001), we get a palindrome (651888156).

The spelling of 100642155 in words is "one hundred million, six hundred forty-two thousand, one hundred fifty-five".