68451381 has 12 divisors (see below), whose sum is σ = 103173408. Its totient is φ = 43650024.

The previous prime is 68451377. The next prime is 68451389. The reversal of 68451381 is 18315486.

68451381 is a `hidden beast` number, since 68 + 4 + 513 + 81 = 666.

It is not a de Polignac number, because 68451381 - 2² = 68451377 is a prime.

It is a super-2 number, since 2×68451381² = 9371183121614322, which contains 22 as substring.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68451389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165135 + ... + 165548.

It is an arithmetic number, because the mean of its divisors is an integer number (8597784).

Almost surely, 2^68451381 is an apocalyptic number.

It is an amenable number.

68451381 is a deficient number, since it is larger than the sum of its proper divisors (34722027).

68451381 is a wasteful number, since it uses less digits than its factorization.

68451381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330712 (or 330709 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 68451381 is about 8273.5349760547. The cubic root of 68451381 is about 409.0666474366.

The spelling of 68451381 in words is "sixty-eight million, four hundred fifty-one thousand, three hundred eighty-one".