189478313 has 2 divisors, whose sum is σ = 189478314. Its totient is φ = 189478312.

The previous prime is 189478283. The next prime is 189478321. The reversal of 189478313 is 313874981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178275904 + 11202409 = 13352^2 + 3347^2 .

It is a cyclic number.

It is not a de Polignac number, because 189478313 - 2⁸ = 189478057 is a prime.

It is not a weakly prime, because it can be changed into another prime (189478363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94739156 + 94739157.

It is an arithmetic number, because the mean of its divisors is an integer number (94739157).

Almost surely, 2^189478313 is an apocalyptic number.

It is an amenable number.

189478313 is a deficient number, since it is larger than the sum of its proper divisors (1).

189478313 is an equidigital number, since it uses as much as digits as its factorization.

189478313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 189478313 is about 13765.1121680864. The cubic root of 189478313 is about 574.3630633357.

The spelling of 189478313 in words is "one hundred eighty-nine million, four hundred seventy-eight thousand, three hundred thirteen".