122491381 has 2 divisors, whose sum is σ = 122491382. Its totient is φ = 122491380.

The previous prime is 122491379. The next prime is 122491429. The reversal of 122491381 is 183194221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119902500 + 2588881 = 10950^2 + 1609^2 .

It is a cyclic number.

It is not a de Polignac number, because 122491381 - 2¹ = 122491379 is a prime.

It is a super-2 number, since 2×122491381² = 30008276838574322, which contains 22 as substring.

Together with 122491379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122491301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61245690 + 61245691.

It is an arithmetic number, because the mean of its divisors is an integer number (61245691).

Almost surely, 2^122491381 is an apocalyptic number.

It is an amenable number.

122491381 is a deficient number, since it is larger than the sum of its proper divisors (1).

122491381 is an equidigital number, since it uses as much as digits as its factorization.

122491381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The square root of 122491381 is about 11067.5824370094. The cubic root of 122491381 is about 496.6325460898.

The spelling of 122491381 in words is "one hundred twenty-two million, four hundred ninety-one thousand, three hundred eighty-one".