31138453 has 4 divisors (see below), whose sum is σ = 31249548. Its totient is φ = 31027360.

The previous prime is 31138447. The next prime is 31138517. The reversal of 31138453 is 35483113.

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 15194404 + 15944049 = 3898^2 + 3993^2 .

It is a cyclic number.

It is not a de Polignac number, because 31138453 - 2⁵ = 31138421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31138153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55126 + ... + 55687.

It is an arithmetic number, because the mean of its divisors is an integer number (7812387).

Almost surely, 2^31138453 is an apocalyptic number.

It is an amenable number.

31138453 is a deficient number, since it is larger than the sum of its proper divisors (111095).

31138453 is a wasteful number, since it uses less digits than its factorization.

31138453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111094.

The product of its digits is 4320, while the sum is 28.

The square root of 31138453 is about 5580.1839575412. The cubic root of 31138453 is about 314.6050412321.

The spelling of 31138453 in words is "thirty-one million, one hundred thirty-eight thousand, four hundred fifty-three".