1243151897 has 4 divisors (see below), whose sum is σ = 1338778980. Its totient is φ = 1147524816.

The previous prime is 1243151881. The next prime is 1243151971. The reversal of 1243151897 is 7981513421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 526197721 + 716954176 = 22939^2 + 26776^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243151897 - 2⁴ = 1243151881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243151597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47813522 + ... + 47813547.

It is an arithmetic number, because the mean of its divisors is an integer number (334694745).

Almost surely, 2^1243151897 is an apocalyptic number.

It is an amenable number.

1243151897 is a deficient number, since it is larger than the sum of its proper divisors (95627083).

1243151897 is an equidigital number, since it uses as much as digits as its factorization.

1243151897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95627082.

The product of its digits is 60480, while the sum is 41.

The square root of 1243151897 is about 35258.3592499708. The cubic root of 1243151897 is about 1075.2465695810.

The spelling of 1243151897 in words is "one billion, two hundred forty-three million, one hundred fifty-one thousand, eight hundred ninety-seven".