1601015551 has 4 divisors (see below), whose sum is σ = 1601120752. Its totient is φ = 1600910352.

The previous prime is 1601015543. The next prime is 1601015569. The reversal of 1601015551 is 1555101061.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1601015551 - 2³ = 1601015543 is a prime.

It is a super-3 number, since 3×1601015551³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601015531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24915 + ... + 61828.

It is an arithmetic number, because the mean of its divisors is an integer number (400280188).

Almost surely, 2^1601015551 is an apocalyptic number.

1601015551 is a deficient number, since it is larger than the sum of its proper divisors (105201).

1601015551 is an equidigital number, since it uses as much as digits as its factorization.

1601015551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105200.

The product of its (nonzero) digits is 750, while the sum is 25.

The square root of 1601015551 is about 40012.6923737956. The cubic root of 1601015551 is about 1169.8545003764.

The spelling of 1601015551 in words is "one billion, six hundred one million, fifteen thousand, five hundred fifty-one".