187850881 has 2 divisors, whose sum is σ = 187850882. Its totient is φ = 187850880.

The previous prime is 187850801. The next prime is 187850909. The reversal of 187850881 is 188058781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139617856 + 48233025 = 11816^2 + 6945^2 .

It is a cyclic number.

It is not a de Polignac number, because 187850881 - 2¹¹ = 187848833 is a prime.

It is a super-2 number, since 2×187850881² = 70575906984952322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (187850801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93925440 + 93925441.

It is an arithmetic number, because the mean of its divisors is an integer number (93925441).

Almost surely, 2^187850881 is an apocalyptic number.

It is an amenable number.

187850881 is a deficient number, since it is larger than the sum of its proper divisors (1).

187850881 is an equidigital number, since it uses as much as digits as its factorization.

187850881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 143360, while the sum is 46.

The square root of 187850881 is about 13705.8703116584. The cubic root of 187850881 is about 572.7139285552.

The spelling of 187850881 in words is "one hundred eighty-seven million, eight hundred fifty thousand, eight hundred eighty-one".