1931248149 has 4 divisors (see below), whose sum is σ = 2574997536. Its totient is φ = 1287498764.

The previous prime is 1931248147. The next prime is 1931248171. The reversal of 1931248149 is 9418421391.

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 not a de Polignac number, because 1931248149 - 2¹ = 1931248147 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1931248149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1931248147) 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, 321874689 + ... + 321874694.

It is an arithmetic number, because the mean of its divisors is an integer number (643749384).

Almost surely, 2^1931248149 is an apocalyptic number.

It is an amenable number.

1931248149 is a deficient number, since it is larger than the sum of its proper divisors (643749387).

1931248149 is an equidigital number, since it uses as much as digits as its factorization.

1931248149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643749386.

The product of its digits is 62208, while the sum is 42.

The square root of 1931248149 is about 43945.9685181701. The cubic root of 1931248149 is about 1245.3154040337.

The spelling of 1931248149 in words is "one billion, nine hundred thirty-one million, two hundred forty-eight thousand, one hundred forty-nine".