155636401 has 4 divisors (see below), whose sum is σ = 155742832. Its totient is φ = 155529972.

The previous prime is 155636363. The next prime is 155636419. The reversal of 155636401 is 104636551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 104636551 = 41 ⋅2552111.

It is a cyclic number.

It is not a de Polignac number, because 155636401 - 2⁹ = 155635889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155636441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50991 + ... + 53956.

It is an arithmetic number, because the mean of its divisors is an integer number (38935708).

Almost surely, 2^155636401 is an apocalyptic number.

It is an amenable number.

155636401 is a deficient number, since it is larger than the sum of its proper divisors (106431).

155636401 is a wasteful number, since it uses less digits than its factorization.

155636401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106430.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 155636401 is about 12475.4318963313. The cubic root of 155636401 is about 537.9027027929.

The spelling of 155636401 in words is "one hundred fifty-five million, six hundred thirty-six thousand, four hundred one".