1231500379 has 2 divisors, whose sum is σ = 1231500380. Its totient is φ = 1231500378.

The previous prime is 1231500377. The next prime is 1231500443. The reversal of 1231500379 is 9730051321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231500379 - 2¹ = 1231500377 is a prime.

Together with 1231500377, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1231500379.

It is not a weakly prime, because it can be changed into another prime (1231500377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615750189 + 615750190.

It is an arithmetic number, because the mean of its divisors is an integer number (615750190).

Almost surely, 2^1231500379 is an apocalyptic number.

1231500379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231500379 is an equidigital number, since it uses as much as digits as its factorization.

1231500379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 1231500379 is about 35092.7396907110. The cubic root of 1231500379 is about 1071.8767479497.

The spelling of 1231500379 in words is "one billion, two hundred thirty-one million, five hundred thousand, three hundred seventy-nine".