7133981 has 4 divisors (see below), whose sum is σ = 7141632. Its totient is φ = 7126332.

The previous prime is 7133969. The next prime is 7133983. The reversal of 7133981 is 1893317.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7133981 is a prime.

It is a super-2 number, since 2×7133981² = 101787369816722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7133983) 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, 2195 + ... + 4368.

It is an arithmetic number, because the mean of its divisors is an integer number (1785408).

Almost surely, 2^7133981 is an apocalyptic number.

It is an amenable number.

7133981 is a deficient number, since it is larger than the sum of its proper divisors (7651).

7133981 is a wasteful number, since it uses less digits than its factorization.

7133981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7650.

The product of its digits is 4536, while the sum is 32.

The square root of 7133981 is about 2670.9513286468. The cubic root of 7133981 is about 192.5058726493.

The spelling of 7133981 in words is "seven million, one hundred thirty-three thousand, nine hundred eighty-one".