103181391 has 16 divisors (see below), whose sum is σ = 158133600. Its totient is φ = 66415104.

The previous prime is 103181369. The next prime is 103181399. The reversal of 103181391 is 193181301.

It is a happy number.

It is not a de Polignac number, because 103181391 - 2⁵ = 103181359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103181399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65106 + ... + 66671.

It is an arithmetic number, because the mean of its divisors is an integer number (9883350).

Almost surely, 2^103181391 is an apocalyptic number.

103181391 is a deficient number, since it is larger than the sum of its proper divisors (54952209).

103181391 is a wasteful number, since it uses less digits than its factorization.

103181391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131815 (or 131809 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 103181391 is about 10157.8241272430. The cubic root of 103181391 is about 469.0298246029.

The spelling of 103181391 in words is "one hundred three million, one hundred eighty-one thousand, three hundred ninety-one".