7132781 has 2 divisors, whose sum is σ = 7132782. Its totient is φ = 7132780.

The previous prime is 7132751. The next prime is 7132813. The reversal of 7132781 is 1872317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7070281 + 62500 = 2659^2 + 250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7132781 is a prime.

It is a super-2 number, since 2×7132781² = 101753129587922, which contains 22 as substring.

It is equal to p₄₈₅₀₇₅ and since 7132781 and 485075 have the same sum of digits, it is a Honaker prime.

It is a zygodrome in base 5.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7132751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3566390 + 3566391.

It is an arithmetic number, because the mean of its divisors is an integer number (3566391).

Almost surely, 2^7132781 is an apocalyptic number.

It is an amenable number.

7132781 is a deficient number, since it is larger than the sum of its proper divisors (1).

7132781 is an equidigital number, since it uses as much as digits as its factorization.

7132781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 29.

The square root of 7132781 is about 2670.7266801378. The cubic root of 7132781 is about 192.4950783022.

The spelling of 7132781 in words is "seven million, one hundred thirty-two thousand, seven hundred eighty-one".