187351948921 has 2 divisors, whose sum is σ = 187351948922. Its totient is φ = 187351948920.

The previous prime is 187351948873. The next prime is 187351948969. The reversal of 187351948921 is 129849153781.

It is a balanced prime because it is at equal distance from previous prime (187351948873) and next prime (187351948969).

It can be written as a sum of positive squares in only one way, i.e., 179215908921 + 8136040000 = 423339^2 + 90200^2 .

It is a cyclic number.

It is not a de Polignac number, because 187351948921 - 2⁷ = 187351948793 is a prime.

It is not a weakly prime, because it can be changed into another prime (187351928921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93675974460 + 93675974461.

It is an arithmetic number, because the mean of its divisors is an integer number (93675974461).

Almost surely, 2^187351948921 is an apocalyptic number.

It is an amenable number.

187351948921 is a deficient number, since it is larger than the sum of its proper divisors (1).

187351948921 is an equidigital number, since it uses as much as digits as its factorization.

187351948921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 58.

The spelling of 187351948921 in words is "one hundred eighty-seven billion, three hundred fifty-one million, nine hundred forty-eight thousand, nine hundred twenty-one".