187661101 has 2 divisors, whose sum is σ = 187661102. Its totient is φ = 187661100.

The previous prime is 187661087. The next prime is 187661107. The reversal of 187661101 is 101166781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129367876 + 58293225 = 11374^2 + 7635^2 .

It is an emirp because it is prime and its reverse (101166781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 187661101 - 2⁵ = 187661069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187661107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93830550 + 93830551.

It is an arithmetic number, because the mean of its divisors is an integer number (93830551).

Almost surely, 2^187661101 is an apocalyptic number.

It is an amenable number.

187661101 is a deficient number, since it is larger than the sum of its proper divisors (1).

187661101 is an equidigital number, since it uses as much as digits as its factorization.

187661101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 187661101 is about 13698.9452513688. The cubic root of 187661101 is about 572.5209984480.

The spelling of 187661101 in words is "one hundred eighty-seven million, six hundred sixty-one thousand, one hundred one".