397631136401 has 4 divisors (see below), whose sum is σ = 397694978100. Its totient is φ = 397567294704.

The previous prime is 397631136361. The next prime is 397631136421. The reversal of 397631136401 is 104631136793.

It is a Cunningham number, because it is equal to 630580²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 201026689600 + 196604446801 = 448360^2 + 443401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397631136401 is a prime.

It is a super-2 number, since 2×397631136401² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (397631136421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31911506 + ... + 31923963.

It is an arithmetic number, because the mean of its divisors is an integer number (99423744525).

Almost surely, 2^397631136401 is an apocalyptic number.

It is an amenable number.

397631136401 is a deficient number, since it is larger than the sum of its proper divisors (63841699).

397631136401 is an equidigital number, since it uses as much as digits as its factorization.

397631136401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63841698.

The product of its (nonzero) digits is 244944, while the sum is 44.

The spelling of 397631136401 in words is "three hundred ninety-seven billion, six hundred thirty-one million, one hundred thirty-six thousand, four hundred one".