122451381 has 24 divisors (see below), whose sum is σ = 190879416. Its totient is φ = 75196800.

The previous prime is 122451367. The next prime is 122451383. The reversal of 122451381 is 183154221.

It can be written as a sum of positive squares in 4 ways, for example, as 40259025 + 82192356 = 6345^2 + 9066^2 .

It is not a de Polignac number, because 122451381 - 2¹¹ = 122449333 is a prime.

It is a super-2 number, since 2×122451381² = 29988681417614322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122451383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81271 + ... + 82763.

It is an arithmetic number, because the mean of its divisors is an integer number (7953309).

Almost surely, 2^122451381 is an apocalyptic number.

It is an amenable number.

122451381 is a deficient number, since it is larger than the sum of its proper divisors (68428035).

122451381 is a wasteful number, since it uses less digits than its factorization.

122451381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213 (or 2210 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 122451381 is about 11065.7752100790. The cubic root of 122451381 is about 496.5784811576.

The spelling of 122451381 in words is "one hundred twenty-two million, four hundred fifty-one thousand, three hundred eighty-one".