155142401 has 4 divisors (see below), whose sum is σ = 158926404. Its totient is φ = 151358400.

The previous prime is 155142367. The next prime is 155142433. The reversal of 155142401 is 104241551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8151025 + 146991376 = 2855^2 + 12124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155142401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155142451) 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, 1891940 + ... + 1892021.

It is an arithmetic number, because the mean of its divisors is an integer number (39731601).

Almost surely, 2^155142401 is an apocalyptic number.

It is an amenable number.

155142401 is a deficient number, since it is larger than the sum of its proper divisors (3784003).

155142401 is an equidigital number, since it uses as much as digits as its factorization.

155142401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3784002.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 155142401 is about 12455.6172468489. The cubic root of 155142401 is about 537.3329869426.

Adding to 155142401 its reverse (104241551), we get a palindrome (259383952).

The spelling of 155142401 in words is "one hundred fifty-five million, one hundred forty-two thousand, four hundred one".