401655697 has 2 divisors, whose sum is σ = 401655698. Its totient is φ = 401655696.

The previous prime is 401655691. The next prime is 401655701. The reversal of 401655697 is 796556104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401240961 + 414736 = 20031^2 + 644^2 .

It is a cyclic number.

It is not a de Polignac number, because 401655697 - 2¹¹ = 401653649 is a prime.

It is a super-2 number, since 2×401655697² = 322654597865111618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401655691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200827848 + 200827849.

It is an arithmetic number, because the mean of its divisors is an integer number (200827849).

Almost surely, 2^401655697 is an apocalyptic number.

It is an amenable number.

401655697 is a deficient number, since it is larger than the sum of its proper divisors (1).

401655697 is an equidigital number, since it uses as much as digits as its factorization.

401655697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 401655697 is about 20041.3496800989. The cubic root of 401655697 is about 737.8215069343.

The spelling of 401655697 in words is "four hundred one million, six hundred fifty-five thousand, six hundred ninety-seven".