155505001 has 16 divisors (see below), whose sum is σ = 173124864. Its totient is φ = 138924544.

The previous prime is 155504957. The next prime is 155505011. The reversal of 155505001 is 100505551.

It is a de Polignac number, because none of the positive numbers 2^k-155505001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155505011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52116 + ... + 55018.

It is an arithmetic number, because the mean of its divisors is an integer number (10820304).

Almost surely, 2^155505001 is an apocalyptic number.

It is an amenable number.

155505001 is a deficient number, since it is larger than the sum of its proper divisors (17619863).

155505001 is a wasteful number, since it uses less digits than its factorization.

155505001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080.

The product of its (nonzero) digits is 625, while the sum is 22.

The square root of 155505001 is about 12470.1644335590. The cubic root of 155505001 is about 537.7512808135.

The spelling of 155505001 in words is "one hundred fifty-five million, five hundred five thousand, one".