7422781 has 2 divisors, whose sum is σ = 7422782. Its totient is φ = 7422780.

The previous prime is 7422743. The next prime is 7422827. The reversal of 7422781 is 1872247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7338681 + 84100 = 2709^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 7422781 - 2¹¹ = 7420733 is a prime.

It is a super-2 number, since 2×7422781² = 110195355547922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7422281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3711390 + 3711391.

It is an arithmetic number, because the mean of its divisors is an integer number (3711391).

Almost surely, 2^7422781 is an apocalyptic number.

It is an amenable number.

7422781 is a deficient number, since it is larger than the sum of its proper divisors (1).

7422781 is an equidigital number, since it uses as much as digits as its factorization.

7422781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 31.

The square root of 7422781 is about 2724.4781151626. The cubic root of 7422781 is about 195.0692806643.

The spelling of 7422781 in words is "seven million, four hundred twenty-two thousand, seven hundred eighty-one".