155502401 has 4 divisors (see below), whose sum is σ = 155527812. Its totient is φ = 155476992.

The previous prime is 155502341. The next prime is 155502407. The reversal of 155502401 is 104205551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 63361600 + 92140801 = 7960^2 + 9599^2 .

It is a cyclic number.

It is not a de Polignac number, because 155502401 - 2¹⁸ = 155240257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155502407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2705 + ... + 17841.

It is an arithmetic number, because the mean of its divisors is an integer number (38881953).

Almost surely, 2^155502401 is an apocalyptic number.

It is an amenable number.

155502401 is a deficient number, since it is larger than the sum of its proper divisors (25411).

155502401 is a wasteful number, since it uses less digits than its factorization.

155502401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25410.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 155502401 is about 12470.0601842974. The cubic root of 155502401 is about 537.7482837799.

Adding to 155502401 its reverse (104205551), we get a palindrome (259707952).

The spelling of 155502401 in words is "one hundred fifty-five million, five hundred two thousand, four hundred one".