1254214991 has 2 divisors, whose sum is σ = 1254214992. Its totient is φ = 1254214990.

The previous prime is 1254214987. The next prime is 1254215041. The reversal of 1254214991 is 1994124521.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1994124521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1254214991 - 2² = 1254214987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1254214391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627107495 + 627107496.

It is an arithmetic number, because the mean of its divisors is an integer number (627107496).

Almost surely, 2^1254214991 is an apocalyptic number.

1254214991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1254214991 is an equidigital number, since it uses as much as digits as its factorization.

1254214991 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 1254214991 is about 35414.8978679877. The cubic root of 1254214991 is about 1078.4267763454.

The spelling of 1254214991 in words is "one billion, two hundred fifty-four million, two hundred fourteen thousand, nine hundred ninety-one".