1245271387 has 4 divisors (see below), whose sum is σ = 1245343680. Its totient is φ = 1245199096.

The previous prime is 1245271367. The next prime is 1245271429. The reversal of 1245271387 is 7831725421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7831725421 = 13 ⋅602440417.

It is a cyclic number.

It is not a de Polignac number, because 1245271387 - 2¹¹ = 1245269339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245271367) 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, 6333 + ... + 50305.

It is an arithmetic number, because the mean of its divisors is an integer number (311335920).

Almost surely, 2^1245271387 is an apocalyptic number.

1245271387 is a deficient number, since it is larger than the sum of its proper divisors (72293).

1245271387 is an equidigital number, since it uses as much as digits as its factorization.

1245271387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72292.

The product of its digits is 94080, while the sum is 40.

The square root of 1245271387 is about 35288.4030100542. The cubic root of 1245271387 is about 1075.8572968828.

The spelling of 1245271387 in words is "one billion, two hundred forty-five million, two hundred seventy-one thousand, three hundred eighty-seven".