131434021 has 12 divisors (see below), whose sum is σ = 140162692. Its totient is φ = 123222528.

The previous prime is 131434019. The next prime is 131434031. The reversal of 131434021 is 120434131.

It can be written as a sum of positive squares in 6 ways, for example, as 8468100 + 122965921 = 2910^2 + 11089^2 .

It is not a de Polignac number, because 131434021 - 2¹ = 131434019 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 131434021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131434031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89731 + ... + 91183.

Almost surely, 2^131434021 is an apocalyptic number.

It is an amenable number.

131434021 is a deficient number, since it is larger than the sum of its proper divisors (8728671).

131434021 is a wasteful number, since it uses less digits than its factorization.

131434021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800 (or 1783 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 131434021 is about 11464.4677591243. The cubic root of 131434021 is about 508.4355764122.

Adding to 131434021 its reverse (120434131), we get a palindrome (251868152).

The spelling of 131434021 in words is "one hundred thirty-one million, four hundred thirty-four thousand, twenty-one".