1601511012 has 18 divisors (see below), whose sum is σ = 4048264038. Its totient is φ = 533836992.

The previous prime is 1601510971. The next prime is 1601511029. The reversal of 1601511012 is 2101151061.

It is a happy number.

1601511012 is a `hidden beast` number, since 1 + 601 + 51 + 1 + 0 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1028100096 + 573410916 = 32064^2 + 23946^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22243173 + ... + 22243244.

Almost surely, 2^1601511012 is an apocalyptic number.

1601511012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1601511012 is an abundant number, since it is smaller than the sum of its proper divisors (2446753026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1601511012 is a wasteful number, since it uses less digits than its factorization.

1601511012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44486427 (or 44486422 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

The square root of 1601511012 is about 40018.8831928129. The cubic root of 1601511012 is about 1169.9751649342.

Adding to 1601511012 its reverse (2101151061), we get a palindrome (3702662073).

The spelling of 1601511012 in words is "one billion, six hundred one million, five hundred eleven thousand, twelve".