401655799 has 2 divisors, whose sum is σ = 401655800. Its totient is φ = 401655798.

The previous prime is 401655797. The next prime is 401655811. The reversal of 401655799 is 997556104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401655799 - 2¹ = 401655797 is a prime.

It is a super-2 number, since 2×401655799² = 322654761740656802, which contains 22 as substring.

Together with 401655797, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401655797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200827899 + 200827900.

It is an arithmetic number, because the mean of its divisors is an integer number (200827900).

Almost surely, 2^401655799 is an apocalyptic number.

401655799 is a deficient number, since it is larger than the sum of its proper divisors (1).

401655799 is an equidigital number, since it uses as much as digits as its factorization.

401655799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 46.

The square root of 401655799 is about 20041.3522248375. The cubic root of 401655799 is about 737.8215693906.

The spelling of 401655799 in words is "four hundred one million, six hundred fifty-five thousand, seven hundred ninety-nine".