401655797 has 2 divisors, whose sum is σ = 401655798. Its totient is φ = 401655796.

The previous prime is 401655743. The next prime is 401655799. The reversal of 401655797 is 797556104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379509361 + 22146436 = 19481^2 + 4706^2 .

It is a cyclic number.

It is not a de Polignac number, because 401655797 - 2¹⁶ = 401590261 is a prime.

It is a super-2 number, since 2×401655797² = 322654758527410418, which contains 22 as substring.

Together with 401655799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401655799) 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, 200827898 + 200827899.

It is an arithmetic number, because the mean of its divisors is an integer number (200827899).

Almost surely, 2^401655797 is an apocalyptic number.

It is an amenable number.

401655797 is a deficient number, since it is larger than the sum of its proper divisors (1).

401655797 is an equidigital number, since it uses as much as digits as its factorization.

401655797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264600, while the sum is 44.

The square root of 401655797 is about 20041.3521749407. The cubic root of 401655797 is about 737.8215681660.

The spelling of 401655797 in words is "four hundred one million, six hundred fifty-five thousand, seven hundred ninety-seven".