155606401 has 4 divisors (see below), whose sum is σ = 155944404. Its totient is φ = 155268400.

The previous prime is 155606393. The next prime is 155606411. The reversal of 155606401 is 104606551.

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 77018176 + 78588225 = 8776^2 + 8865^2 .

It is a cyclic number.

It is not a de Polignac number, because 155606401 - 2³ = 155606393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155606401.

It is not an unprimeable number, because it can be changed into a prime (155606411) 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, 168310 + ... + 169231.

It is an arithmetic number, because the mean of its divisors is an integer number (38986101).

Almost surely, 2^155606401 is an apocalyptic number.

It is an amenable number.

155606401 is a deficient number, since it is larger than the sum of its proper divisors (338003).

155606401 is an equidigital number, since it uses as much as digits as its factorization.

155606401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338002.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 155606401 is about 12474.2294752021. The cubic root of 155606401 is about 537.8681390749.

The spelling of 155606401 in words is "one hundred fifty-five million, six hundred six thousand, four hundred one".