1681369937 has 4 divisors (see below), whose sum is σ = 1810706100. Its totient is φ = 1552033776.

The previous prime is 1681369931. The next prime is 1681370003. The reversal of 1681369937 is 7399631861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7399631861 = 28571 ⋅258991.

It can be written as a sum of positive squares in 2 ways, for example, as 68624656 + 1612745281 = 8284^2 + 40159^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681369937 - 2¹⁸ = 1681107793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681369931) 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, 64668062 + ... + 64668087.

It is an arithmetic number, because the mean of its divisors is an integer number (452676525).

Almost surely, 2^1681369937 is an apocalyptic number.

It is an amenable number.

1681369937 is a deficient number, since it is larger than the sum of its proper divisors (129336163).

1681369937 is a wasteful number, since it uses less digits than its factorization.

1681369937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129336162.

The product of its digits is 1469664, while the sum is 53.

The square root of 1681369937 is about 41004.5111786496. The cubic root of 1681369937 is about 1189.1074296912.

The spelling of 1681369937 in words is "one billion, six hundred eighty-one million, three hundred sixty-nine thousand, nine hundred thirty-seven".