1601055551 has 4 divisors (see below), whose sum is σ = 1608643704. Its totient is φ = 1593467400.

The previous prime is 1601055509. The next prime is 1601055557. The reversal of 1601055551 is 1555501061.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1601055551 - 2⁶ = 1601055487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601055557) 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, 3793760 + ... + 3794181.

It is an arithmetic number, because the mean of its divisors is an integer number (402160926).

Almost surely, 2^1601055551 is an apocalyptic number.

1601055551 is a deficient number, since it is larger than the sum of its proper divisors (7588153).

1601055551 is an equidigital number, since it uses as much as digits as its factorization.

1601055551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7588152.

The product of its (nonzero) digits is 3750, while the sum is 29.

The square root of 1601055551 is about 40013.1922120693. The cubic root of 1601055551 is about 1169.8642428990.

The spelling of 1601055551 in words is "one billion, six hundred one million, fifty-five thousand, five hundred fifty-one".