131321749 has 8 divisors (see below), whose sum is σ = 148867040. Its totient is φ = 114839856.

The previous prime is 131321747. The next prime is 131321759. The reversal of 131321749 is 947123131.

131321749 = 2620² + 2621² + ... + 2638².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131321749 - 2¹ = 131321747 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 131321749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131321747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265587 + ... + 266080.

It is an arithmetic number, because the mean of its divisors is an integer number (18608380).

Almost surely, 2^131321749 is an apocalyptic number.

131321749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

131321749 is a deficient number, since it is larger than the sum of its proper divisors (17545291).

131321749 is a wasteful number, since it uses less digits than its factorization.

131321749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531699.

The product of its digits is 4536, while the sum is 31.

The square root of 131321749 is about 11459.5701926381. The cubic root of 131321749 is about 508.2907652491.

The spelling of 131321749 in words is "one hundred thirty-one million, three hundred twenty-one thousand, seven hundred forty-nine".