155222401 has 4 divisors (see below), whose sum is σ = 157408704. Its totient is φ = 153036100.

The previous prime is 155222357. The next prime is 155222447. The reversal of 155222401 is 104222551.

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: 104222551 = 439 ⋅237409.

It is a cyclic number.

It is not a de Polignac number, because 155222401 - 2⁹ = 155221889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155222701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1093045 + ... + 1093186.

It is an arithmetic number, because the mean of its divisors is an integer number (39352176).

Almost surely, 2^155222401 is an apocalyptic number.

It is an amenable number.

155222401 is a deficient number, since it is larger than the sum of its proper divisors (2186303).

155222401 is an equidigital number, since it uses as much as digits as its factorization.

155222401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2186302.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 155222401 is about 12458.8282354321. The cubic root of 155222401 is about 537.4253306045.

Adding to 155222401 its reverse (104222551), we get a palindrome (259444952).

The spelling of 155222401 in words is "one hundred fifty-five million, two hundred twenty-two thousand, four hundred one".