401512691 has 2 divisors, whose sum is σ = 401512692. Its totient is φ = 401512690.

The previous prime is 401512669. The next prime is 401512697. The reversal of 401512691 is 196215104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401512691 - 2¹⁸ = 401250547 is a prime.

It is a super-2 number, since 2×401512691² = 322424882068122962, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (401512697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200756345 + 200756346.

It is an arithmetic number, because the mean of its divisors is an integer number (200756346).

Almost surely, 2^401512691 is an apocalyptic number.

401512691 is a deficient number, since it is larger than the sum of its proper divisors (1).

401512691 is an equidigital number, since it uses as much as digits as its factorization.

401512691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 401512691 is about 20037.7815887887. The cubic root of 401512691 is about 737.7339315739.

Adding to 401512691 its reverse (196215104), we get a palindrome (597727795).

The spelling of 401512691 in words is "four hundred one million, five hundred twelve thousand, six hundred ninety-one".