1555401801 has 8 divisors (see below), whose sum is σ = 2075629824. Its totient is φ = 1036054160.

The previous prime is 1555401773. The next prime is 1555401803. The reversal of 1555401801 is 1081045551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1555401801 - 2¹⁷ = 1555270729 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1555401803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215961 + ... + 223046.

It is an arithmetic number, because the mean of its divisors is an integer number (259453728).

Almost surely, 2^1555401801 is an apocalyptic number.

It is an amenable number.

1555401801 is a deficient number, since it is larger than the sum of its proper divisors (520228023).

1555401801 is a wasteful number, since it uses less digits than its factorization.

1555401801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440191.

The product of its (nonzero) digits is 4000, while the sum is 30.

The square root of 1555401801 is about 39438.5826444105. The cubic root of 1555401801 is about 1158.6373716854.

The spelling of 1555401801 in words is "one billion, five hundred fifty-five million, four hundred one thousand, eight hundred one".