111451381 has 2 divisors, whose sum is σ = 111451382. Its totient is φ = 111451380.

The previous prime is 111451367. The next prime is 111451387. The reversal of 111451381 is 183154111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105370225 + 6081156 = 10265^2 + 2466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111451381 is a prime.

It is a super-2 number, since 2×111451381² = 24842820653614322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111451387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55725690 + 55725691.

It is an arithmetic number, because the mean of its divisors is an integer number (55725691).

Almost surely, 2^111451381 is an apocalyptic number.

It is an amenable number.

111451381 is a deficient number, since it is larger than the sum of its proper divisors (1).

111451381 is an equidigital number, since it uses as much as digits as its factorization.

111451381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 25.

The square root of 111451381 is about 10557.0536135799. The cubic root of 111451381 is about 481.2401107542.

The spelling of 111451381 in words is "one hundred eleven million, four hundred fifty-one thousand, three hundred eighty-one".