7138531 has 4 divisors (see below), whose sum is σ = 7144200. Its totient is φ = 7132864.

The previous prime is 7138513. The next prime is 7138541. The reversal of 7138531 is 1358317.

7138531 is a nontrivial binomial coefficient, being equal to C(3779, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1358317 = 17 ⋅79901.

It is not a de Polignac number, because 7138531 - 2¹¹ = 7136483 is a prime.

It is a super-2 number, since 2×7138531² = 101917249675922, which contains 22 as substring.

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 7138531.

It is not an unprimeable number, because it can be changed into a prime (7138541) 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, 1 + ... + 3778.

It is an arithmetic number, because the mean of its divisors is an integer number (1786050).

Almost surely, 2^7138531 is an apocalyptic number.

7138531 is the 3778-th triangular number.

7138531 is the 1260-th centered nonagonal number.

7138531 is a deficient number, since it is larger than the sum of its proper divisors (5669).

7138531 is a wasteful number, since it uses less digits than its factorization.

7138531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5668.

The product of its digits is 2520, while the sum is 28.

The square root of 7138531 is about 2671.8029493209. The cubic root of 7138531 is about 192.5467902226.

The spelling of 7138531 in words is "seven million, one hundred thirty-eight thousand, five hundred thirty-one".