1937988661 has 12 divisors (see below), whose sum is σ = 2387007468. Its totient is φ = 1563418752.

The previous prime is 1937988649. The next prime is 1937988677. The reversal of 1937988661 is 1668897391.

It can be written as a sum of positive squares in 2 ways, for example, as 996664900 + 941323761 = 31570^2 + 30681^2 .

It is not a de Polignac number, because 1937988661 - 2¹⁷ = 1937857589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1937988596 and 1937988605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1937988161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1162426 + ... + 1164091.

It is an arithmetic number, because the mean of its divisors is an integer number (198917289).

Almost surely, 2^1937988661 is an apocalyptic number.

It is an amenable number.

1937988661 is a deficient number, since it is larger than the sum of its proper divisors (449018807).

1937988661 is a wasteful number, since it uses less digits than its factorization.

1937988661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326548 (or 2326541 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 58.

The square root of 1937988661 is about 44022.5926201536. The cubic root of 1937988661 is about 1246.7625366504.

The spelling of 1937988661 in words is "one billion, nine hundred thirty-seven million, nine hundred eighty-eight thousand, six hundred sixty-one".