1259216381 has 2 divisors, whose sum is σ = 1259216382. Its totient is φ = 1259216380.

The previous prime is 1259216353. The next prime is 1259216383. The reversal of 1259216381 is 1836129521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1224300100 + 34916281 = 34990^2 + 5909^2 .

It is an emirp because it is prime and its reverse (1836129521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1259216381 - 2²² = 1255022077 is a prime.

It is a super-2 number, since 2×1259216381² = 3171251788357474322, which contains 22 as substring.

Together with 1259216383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1259216383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 629608190 + 629608191.

It is an arithmetic number, because the mean of its divisors is an integer number (629608191).

Almost surely, 2^1259216381 is an apocalyptic number.

It is an amenable number.

1259216381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1259216381 is an equidigital number, since it uses as much as digits as its factorization.

1259216381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 38.

The square root of 1259216381 is about 35485.4389996799. The cubic root of 1259216381 is about 1079.8583436178.

The spelling of 1259216381 in words is "one billion, two hundred fifty-nine million, two hundred sixteen thousand, three hundred eighty-one".