7531138 has 4 divisors (see below), whose sum is σ = 11296710. Its totient is φ = 3765568.

The previous prime is 7531127. The next prime is 7531151. The reversal of 7531138 is 8311357.

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

It can be written as a sum of positive squares in only one way, i.e., 7091569 + 439569 = 2663^2 + 663^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1882783 + ... + 1882786.

Almost surely, 2^7531138 is an apocalyptic number.

7531138 is a deficient number, since it is larger than the sum of its proper divisors (3765572).

7531138 is a wasteful number, since it uses less digits than its factorization.

7531138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3765571.

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

The square root of 7531138 is about 2744.2918940958. The cubic root of 7531138 is about 196.0138994724.

It can be divided in two parts, 753 and 1138, that added together give a triangular number (1891 = T₆₁).

The spelling of 7531138 in words is "seven million, five hundred thirty-one thousand, one hundred thirty-eight".