7042781 has 2 divisors, whose sum is σ = 7042782. Its totient is φ = 7042780.

The previous prime is 7042769. The next prime is 7042801. The reversal of 7042781 is 1872407.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5480281 + 1562500 = 2341^2 + 1250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7042781 is a prime.

It is a super-2 number, since 2×7042781² = 99201528427922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7042081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3521390 + 3521391.

It is an arithmetic number, because the mean of its divisors is an integer number (3521391).

Almost surely, 2^7042781 is an apocalyptic number.

It is an amenable number.

7042781 is a deficient number, since it is larger than the sum of its proper divisors (1).

7042781 is an equidigital number, since it uses as much as digits as its factorization.

7042781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 7042781 is about 2653.8238449453. The cubic root of 7042781 is about 191.6820275864.

The spelling of 7042781 in words is "seven million, forty-two thousand, seven hundred eighty-one".