187313389 has 2 divisors, whose sum is σ = 187313390. Its totient is φ = 187313388.

The previous prime is 187313359. The next prime is 187313437. The reversal of 187313389 is 983313781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139122025 + 48191364 = 11795^2 + 6942^2 .

It is a cyclic number.

It is not a de Polignac number, because 187313389 - 2⁷ = 187313261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187313359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93656694 + 93656695.

It is an arithmetic number, because the mean of its divisors is an integer number (93656695).

Almost surely, 2^187313389 is an apocalyptic number.

It is an amenable number.

187313389 is a deficient number, since it is larger than the sum of its proper divisors (1).

187313389 is an equidigital number, since it uses as much as digits as its factorization.

187313389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 187313389 is about 13686.2481710657. The cubic root of 187313389 is about 572.1671771197.

The spelling of 187313389 in words is "one hundred eighty-seven million, three hundred thirteen thousand, three hundred eighty-nine".