201551117 has 2 divisors, whose sum is σ = 201551118. Its totient is φ = 201551116.

The previous prime is 201551111. The next prime is 201551149. The reversal of 201551117 is 711155102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199685161 + 1865956 = 14131^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 201551117 - 2¹⁴ = 201534733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201551092 and 201551101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201551111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100775558 + 100775559.

It is an arithmetic number, because the mean of its divisors is an integer number (100775559).

Almost surely, 2^201551117 is an apocalyptic number.

It is an amenable number.

201551117 is a deficient number, since it is larger than the sum of its proper divisors (1).

201551117 is an equidigital number, since it uses as much as digits as its factorization.

201551117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 350, while the sum is 23.

The square root of 201551117 is about 14196.8699719340. The cubic root of 201551117 is about 586.3114872247.

The spelling of 201551117 in words is "two hundred one million, five hundred fifty-one thousand, one hundred seventeen".