169240381 has 2 divisors, whose sum is σ = 169240382. Its totient is φ = 169240380.

The previous prime is 169240369. The next prime is 169240397. The reversal of 169240381 is 183042961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166177881 + 3062500 = 12891^2 + 1750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169240381 is a prime.

It is a super-2 number, since 2×169240381² = 57284613122050322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169240361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84620190 + 84620191.

It is an arithmetic number, because the mean of its divisors is an integer number (84620191).

Almost surely, 2^169240381 is an apocalyptic number.

It is an amenable number.

169240381 is a deficient number, since it is larger than the sum of its proper divisors (1).

169240381 is an equidigital number, since it uses as much as digits as its factorization.

169240381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 169240381 is about 13009.2421378034. The cubic root of 169240381 is about 553.1394898095.

The spelling of 169240381 in words is "one hundred sixty-nine million, two hundred forty thousand, three hundred eighty-one".