1601004551 has 4 divisors (see below), whose sum is σ = 1609050000. Its totient is φ = 1592959104.

The previous prime is 1601004521. The next prime is 1601004571. The reversal of 1601004551 is 1554001061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1554001061 = 433 ⋅3588917.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1601004551 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 (1601004521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4022426 + ... + 4022823.

It is an arithmetic number, because the mean of its divisors is an integer number (402262500).

Almost surely, 2^1601004551 is an apocalyptic number.

1601004551 is a deficient number, since it is larger than the sum of its proper divisors (8045449).

1601004551 is an equidigital number, since it uses as much as digits as its factorization.

1601004551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8045448.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1601004551 is about 40012.5549171757. The cubic root of 1601004551 is about 1169.8518211543.

The spelling of 1601004551 in words is "one billion, six hundred one million, four thousand, five hundred fifty-one".