1224992381 has 2 divisors, whose sum is σ = 1224992382. Its totient is φ = 1224992380.

The previous prime is 1224992371. The next prime is 1224992473. The reversal of 1224992381 is 1832994221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 632069881 + 592922500 = 25141^2 + 24350^2 .

It is an emirp because it is prime and its reverse (1832994221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1224992381 - 2⁶ = 1224992317 is a prime.

It is a super-2 number, since 2×1224992381² = 3001212667016098322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1224992371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612496190 + 612496191.

It is an arithmetic number, because the mean of its divisors is an integer number (612496191).

Almost surely, 2^1224992381 is an apocalyptic number.

It is an amenable number.

1224992381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224992381 is an equidigital number, since it uses as much as digits as its factorization.

1224992381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 1224992381 is about 34999.8911569736. The cubic root of 1224992381 is about 1069.9852622653.

The spelling of 1224992381 in words is "one billion, two hundred twenty-four million, nine hundred ninety-two thousand, three hundred eighty-one".