7451421781 has 2 divisors, whose sum is σ = 7451421782. Its totient is φ = 7451421780.

The previous prime is 7451421751. The next prime is 7451421811. The reversal of 7451421781 is 1871241547.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (7451421751) and next prime (7451421811).

It can be written as a sum of positive squares in only one way, i.e., 7350318756 + 101103025 = 85734^2 + 10055^2 .

It is a cyclic number.

It is not a de Polignac number, because 7451421781 - 2¹⁵ = 7451389013 is a prime.

It is a super-2 number, since 2×7451421781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7451421721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3725710890 + 3725710891.

It is an arithmetic number, because the mean of its divisors is an integer number (3725710891).

Almost surely, 2^7451421781 is an apocalyptic number.

It is an amenable number.

7451421781 is a deficient number, since it is larger than the sum of its proper divisors (1).

7451421781 is an equidigital number, since it uses as much as digits as its factorization.

7451421781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62720, while the sum is 40.

The square root of 7451421781 is about 86321.6182714388. The cubic root of 7451421781 is about 1953.1985010201.

The spelling of 7451421781 in words is "seven billion, four hundred fifty-one million, four hundred twenty-one thousand, seven hundred eighty-one".