155331401 has 4 divisors (see below), whose sum is σ = 155420112. Its totient is φ = 155242692.

The previous prime is 155331391. The next prime is 155331419. The reversal of 155331401 is 104133551.

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.

It is a cyclic number.

It is not a de Polignac number, because 155331401 - 2²² = 151137097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155331481) 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, 41675 + ... + 45248.

It is an arithmetic number, because the mean of its divisors is an integer number (38855028).

Almost surely, 2^155331401 is an apocalyptic number.

It is an amenable number.

155331401 is a deficient number, since it is larger than the sum of its proper divisors (88711).

155331401 is an equidigital number, since it uses as much as digits as its factorization.

155331401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88710.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 155331401 is about 12463.2018759226. The cubic root of 155331401 is about 537.5510977923.

Adding to 155331401 its reverse (104133551), we get a palindrome (259464952).

The spelling of 155331401 in words is "one hundred fifty-five million, three hundred thirty-one thousand, four hundred one".