172987101 has 18 divisors (see below), whose sum is σ = 290666142. Its totient is φ = 98849520.

The previous prime is 172987093. The next prime is 172987103. The reversal of 172987101 is 101789271.

It can be written as a sum of positive squares in only one way, i.e., 107619876 + 65367225 = 10374^2 + 8085^2 .

It is not a de Polignac number, because 172987101 - 2³ = 172987093 is a prime.

It is a super-2 number, since 2×172987101² = 59849074224768402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172987103) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 195690 + ... + 196571.

It is an arithmetic number, because the mean of its divisors is an integer number (16148119).

Almost surely, 2^172987101 is an apocalyptic number.

It is an amenable number.

172987101 is a deficient number, since it is larger than the sum of its proper divisors (117679041).

172987101 is a wasteful number, since it uses less digits than its factorization.

172987101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392281 (or 392271 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 36.

The square root of 172987101 is about 13152.4560824205. The cubic root of 172987101 is about 557.1916166681.

The spelling of 172987101 in words is "one hundred seventy-two million, nine hundred eighty-seven thousand, one hundred one".