400131071 has 2 divisors, whose sum is σ = 400131072. Its totient is φ = 400131070.

The previous prime is 400131049. The next prime is 400131073. The reversal of 400131071 is 170131004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400131071 - 2²² = 395936767 is a prime.

Together with 400131073, 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 (400131073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200065535 + 200065536.

It is an arithmetic number, because the mean of its divisors is an integer number (200065536).

Almost surely, 2^400131071 is an apocalyptic number.

400131071 is a deficient number, since it is larger than the sum of its proper divisors (1).

400131071 is an equidigital number, since it uses as much as digits as its factorization.

400131071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 400131071 is about 20003.2765066126. The cubic root of 400131071 is about 736.8867692215.

Adding to 400131071 its reverse (170131004), we get a palindrome (570262075).

The spelling of 400131071 in words is "four hundred million, one hundred thirty-one thousand, seventy-one".