400155101 has 2 divisors, whose sum is σ = 400155102. Its totient is φ = 400155100.

The previous prime is 400155083. The next prime is 400155109. The reversal of 400155101 is 101551004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262116100 + 138039001 = 16190^2 + 11749^2 .

It is a cyclic number.

It is not a de Polignac number, because 400155101 - 2¹⁸ = 399892957 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400155101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400155109) 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, 200077550 + 200077551.

It is an arithmetic number, because the mean of its divisors is an integer number (200077551).

Almost surely, 2^400155101 is an apocalyptic number.

It is an amenable number.

400155101 is a deficient number, since it is larger than the sum of its proper divisors (1).

400155101 is an equidigital number, since it uses as much as digits as its factorization.

400155101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 400155101 is about 20003.8771491929. The cubic root of 400155101 is about 736.9015202501.

The spelling of 400155101 in words is "four hundred million, one hundred fifty-five thousand, one hundred one".