1928731137 has 4 divisors (see below), whose sum is σ = 2571641520. Its totient is φ = 1285820756.

The previous prime is 1928731127. The next prime is 1928731157. The reversal of 1928731137 is 7311378291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1928731137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1928731127) 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, 321455187 + ... + 321455192.

It is an arithmetic number, because the mean of its divisors is an integer number (642910380).

Almost surely, 2^1928731137 is an apocalyptic number.

It is an amenable number.

1928731137 is a deficient number, since it is larger than the sum of its proper divisors (642910383).

1928731137 is an equidigital number, since it uses as much as digits as its factorization.

1928731137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642910382.

The product of its digits is 63504, while the sum is 42.

The square root of 1928731137 is about 43917.3216054896. The cubic root of 1928731137 is about 1244.7741588062.

The spelling of 1928731137 in words is "one billion, nine hundred twenty-eight million, seven hundred thirty-one thousand, one hundred thirty-seven".