111281401 has 27 divisors (see below), whose sum is σ = 143333967. Its totient is φ = 86079840.

The previous prime is 111281399. The next prime is 111281437. The reversal of 111281401 is 104182111.

The square root of 111281401 is 10549.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 65367225 + 45914176 = 8085^2 + 6776^2 .

It is not a de Polignac number, because 111281401 - 2¹ = 111281399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111281501) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 812205 + ... + 812341.

Almost surely, 2^111281401 is an apocalyptic number.

111281401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111281401 is the 10549-th square number.

111281401 is the 5275-th centered octagonal number.

It is an amenable number.

111281401 is a deficient number, since it is larger than the sum of its proper divisors (32052566).

111281401 is an equidigital number, since it uses as much as digits as its factorization.

111281401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

The cubic root of 111281401 is about 480.9953319251.

Multiplying 111281401 by its product of nonzero digits (64), we get a square (7122009664 = 84392²).

The spelling of 111281401 in words is "one hundred eleven million, two hundred eighty-one thousand, four hundred one".