155232401 has 4 divisors (see below), whose sum is σ = 155738352. Its totient is φ = 154726452.

The previous prime is 155232397. The next prime is 155232439. The reversal of 155232401 is 104232551.

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: 104232551 = 6653 ⋅15667.

It is a cyclic number.

It is not a de Polignac number, because 155232401 - 2² = 155232397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155232461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252515 + ... + 253128.

It is an arithmetic number, because the mean of its divisors is an integer number (38934588).

Almost surely, 2^155232401 is an apocalyptic number.

It is an amenable number.

155232401 is a deficient number, since it is larger than the sum of its proper divisors (505951).

155232401 is an equidigital number, since it uses as much as digits as its factorization.

155232401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505950.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 155232401 is about 12459.2295508189. The cubic root of 155232401 is about 537.4368713312.

Adding to 155232401 its reverse (104232551), we get a palindrome (259464952).

The spelling of 155232401 in words is "one hundred fifty-five million, two hundred thirty-two thousand, four hundred one".