2151555401 has 8 divisors (see below), whose sum is σ = 2299860864. Its totient is φ = 2007813280.

The previous prime is 2151555391. The next prime is 2151555407. The reversal of 2151555401 is 1045551512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2151555401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151555407) 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 7 ways as a sum of consecutive naturals, for example, 1139861 + ... + 1141746.

It is an arithmetic number, because the mean of its divisors is an integer number (287482608).

Almost surely, 2^2151555401 is an apocalyptic number.

It is an amenable number.

2151555401 is a deficient number, since it is larger than the sum of its proper divisors (148305463).

2151555401 is a wasteful number, since it uses less digits than its factorization.

2151555401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281671.

The product of its (nonzero) digits is 5000, while the sum is 29.

The square root of 2151555401 is about 46384.8617654510. The cubic root of 2151555401 is about 1290.9740457014.

The spelling of 2151555401 in words is "two billion, one hundred fifty-one million, five hundred fifty-five thousand, four hundred one".