155243401 has 4 divisors (see below), whose sum is σ = 156360400. Its totient is φ = 154126404.

The previous prime is 155243393. The next prime is 155243419. The reversal of 155243401 is 104342551.

It is a happy number.

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: 104342551 = 29 ⋅3598019.

It is a cyclic number.

It is not a de Polignac number, because 155243401 - 2³ = 155243393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155243801) 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, 558291 + ... + 558568.

It is an arithmetic number, because the mean of its divisors is an integer number (39090100).

Almost surely, 2^155243401 is an apocalyptic number.

It is an amenable number.

155243401 is a deficient number, since it is larger than the sum of its proper divisors (1116999).

155243401 is a wasteful number, since it uses less digits than its factorization.

155243401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116998.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 155243401 is about 12459.6709828149. The cubic root of 155243401 is about 537.4495655581.

Adding to 155243401 its reverse (104342551), we get a palindrome (259585952).

The spelling of 155243401 in words is "one hundred fifty-five million, two hundred forty-three thousand, four hundred one".