155491401 has 16 divisors (see below), whose sum is σ = 236404224. Its totient is φ = 90057984.

The previous prime is 155491361. The next prime is 155491403. The reversal of 155491401 is 104194551.

It is not a de Polignac number, because 155491401 - 2⁶ = 155491337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155491403) 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 15 ways as a sum of consecutive naturals, for example, 116601 + ... + 117926.

It is an arithmetic number, because the mean of its divisors is an integer number (14775264).

Almost surely, 2^155491401 is an apocalyptic number.

It is an amenable number.

155491401 is a deficient number, since it is larger than the sum of its proper divisors (80912823).

155491401 is a wasteful number, since it uses less digits than its factorization.

155491401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234560.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 155491401 is about 12469.6191200854. The cubic root of 155491401 is about 537.7356036529.

The spelling of 155491401 in words is "one hundred fifty-five million, four hundred ninety-one thousand, four hundred one".