400061281 has 2 divisors, whose sum is σ = 400061282. Its totient is φ = 400061280.

The previous prime is 400061251. The next prime is 400061371. The reversal of 400061281 is 182160004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302446881 + 97614400 = 17391^2 + 9880^2 .

It is a cyclic number.

It is not a de Polignac number, because 400061281 - 2²⁷ = 265843553 is a prime.

It is a super-2 number, since 2×400061281² = 320098057110721922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400061251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200030640 + 200030641.

It is an arithmetic number, because the mean of its divisors is an integer number (200030641).

Almost surely, 2^400061281 is an apocalyptic number.

It is an amenable number.

400061281 is a deficient number, since it is larger than the sum of its proper divisors (1).

400061281 is an equidigital number, since it uses as much as digits as its factorization.

400061281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 400061281 is about 20001.5319663270. The cubic root of 400061281 is about 736.8439246624.

The spelling of 400061281 in words is "four hundred million, sixty-one thousand, two hundred eighty-one".