131403401 has 4 divisors (see below), whose sum is σ = 134608404. Its totient is φ = 128198400.

The previous prime is 131403397. The next prime is 131403457. The reversal of 131403401 is 104304131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43494025 + 87909376 = 6595^2 + 9376^2 .

It is a cyclic number.

It is not a de Polignac number, because 131403401 - 2² = 131403397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131403401.

It is not an unprimeable number, because it can be changed into a prime (131403491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1602440 + ... + 1602521.

It is an arithmetic number, because the mean of its divisors is an integer number (33652101).

Almost surely, 2^131403401 is an apocalyptic number.

It is an amenable number.

131403401 is a deficient number, since it is larger than the sum of its proper divisors (3205003).

131403401 is an equidigital number, since it uses as much as digits as its factorization.

131403401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3205002.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 131403401 is about 11463.1322508292. The cubic root of 131403401 is about 508.3960901707.

Adding to 131403401 its reverse (104304131), we get a palindrome (235707532).

The spelling of 131403401 in words is "one hundred thirty-one million, four hundred three thousand, four hundred one".