1602371861 has 4 divisors (see below), whose sum is σ = 1602516300. Its totient is φ = 1602227424.

The previous prime is 1602371857. The next prime is 1602371863. The reversal of 1602371861 is 1681732061.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1202771761 + 399600100 = 34681^2 + 19990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1602371861 - 2² = 1602371857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1602371863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54056 + ... + 78273.

It is an arithmetic number, because the mean of its divisors is an integer number (400629075).

Almost surely, 2^1602371861 is an apocalyptic number.

It is an amenable number.

1602371861 is a deficient number, since it is larger than the sum of its proper divisors (144439).

1602371861 is a wasteful number, since it uses less digits than its factorization.

1602371861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144438.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1602371861 is about 40029.6372828933. The cubic root of 1602371861 is about 1170.1847569044.

The spelling of 1602371861 in words is "one billion, six hundred two million, three hundred seventy-one thousand, eight hundred sixty-one".