1020155401 has 2 divisors, whose sum is σ = 1020155402. Its totient is φ = 1020155400.

The previous prime is 1020155393. The next prime is 1020155413. The reversal of 1020155401 is 1045510201.

1020155401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 767345401 + 252810000 = 27701^2 + 15900^2 .

It is an emirp because it is prime and its reverse (1045510201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1020155401 - 2³ = 1020155393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020155491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510077700 + 510077701.

It is an arithmetic number, because the mean of its divisors is an integer number (510077701).

Almost surely, 2^1020155401 is an apocalyptic number.

It is an amenable number.

1020155401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020155401 is an equidigital number, since it uses as much as digits as its factorization.

1020155401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 1020155401 is about 31939.8716497108. The cubic root of 1020155401 is about 1006.6738279366.

Adding to 1020155401 its reverse (1045510201), we get a palindrome (2065665602).

It can be divided in two parts, 102015 and 5401, that added together give a triangular number (107416 = T₄₆₃).

The spelling of 1020155401 in words is "one billion, twenty million, one hundred fifty-five thousand, four hundred one".