118690381 has 2 divisors, whose sum is σ = 118690382. Its totient is φ = 118690380.

The previous prime is 118690343. The next prime is 118690387. The reversal of 118690381 is 183096811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93026025 + 25664356 = 9645^2 + 5066^2 .

It is an emirp because it is prime and its reverse (183096811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118690381 - 2¹¹ = 118688333 is a prime.

It is a super-2 number, since 2×118690381² = 28174813083850322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 118690381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118690387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59345190 + 59345191.

It is an arithmetic number, because the mean of its divisors is an integer number (59345191).

Almost surely, 2^118690381 is an apocalyptic number.

It is an amenable number.

118690381 is a deficient number, since it is larger than the sum of its proper divisors (1).

118690381 is an equidigital number, since it uses as much as digits as its factorization.

118690381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 118690381 is about 10894.5115080943. The cubic root of 118690381 is about 491.4415151943.

The spelling of 118690381 in words is "one hundred eighteen million, six hundred ninety thousand, three hundred eighty-one".