406033681 has 2 divisors, whose sum is σ = 406033682. Its totient is φ = 406033680.

The previous prime is 406033679. The next prime is 406033723. The reversal of 406033681 is 186330604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395373456 + 10660225 = 19884^2 + 3265^2 .

It is a cyclic number.

It is not a de Polignac number, because 406033681 - 2¹ = 406033679 is a prime.

It is a super-2 number, since 2×406033681² = 329726700212819522, which contains 22 as substring.

Together with 406033679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (406033631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203016840 + 203016841.

It is an arithmetic number, because the mean of its divisors is an integer number (203016841).

Almost surely, 2^406033681 is an apocalyptic number.

It is an amenable number.

406033681 is a deficient number, since it is larger than the sum of its proper divisors (1).

406033681 is an equidigital number, since it uses as much as digits as its factorization.

406033681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 406033681 is about 20150.2774422587. The cubic root of 406033681 is about 740.4925385448.

The spelling of 406033681 in words is "four hundred six million, thirty-three thousand, six hundred eighty-one".