190918121 has 2 divisors, whose sum is σ = 190918122. Its totient is φ = 190918120.

The previous prime is 190918097. The next prime is 190918127. The reversal of 190918121 is 121819091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173185600 + 17732521 = 13160^2 + 4211^2 .

It is a cyclic number.

It is not a de Polignac number, because 190918121 - 2¹⁸ = 190655977 is a prime.

It is not a weakly prime, because it can be changed into another prime (190918127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95459060 + 95459061.

It is an arithmetic number, because the mean of its divisors is an integer number (95459061).

Almost surely, 2^190918121 is an apocalyptic number.

It is an amenable number.

190918121 is a deficient number, since it is larger than the sum of its proper divisors (1).

190918121 is an equidigital number, since it uses as much as digits as its factorization.

190918121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 190918121 is about 13817.3123652901. The cubic root of 190918121 is about 575.8142173878.

The spelling of 190918121 in words is "one hundred ninety million, nine hundred eighteen thousand, one hundred twenty-one".