1245020143 has 4 divisors (see below), whose sum is σ = 1318256640. Its totient is φ = 1171783648.

The previous prime is 1245020137. The next prime is 1245020149. The reversal of 1245020143 is 3410205421.

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

It is an interprime number because it is at equal distance from previous prime (1245020137) and next prime (1245020149).

It is a cyclic number.

It is not a de Polignac number, because 1245020143 - 2¹⁷ = 1244889071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245020149) 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, 36618223 + ... + 36618256.

It is an arithmetic number, because the mean of its divisors is an integer number (329564160).

Almost surely, 2^1245020143 is an apocalyptic number.

1245020143 is a deficient number, since it is larger than the sum of its proper divisors (73236497).

1245020143 is an equidigital number, since it uses as much as digits as its factorization.

1245020143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73236496.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1245020143 is about 35284.8429640830. The cubic root of 1245020143 is about 1075.7849375898.

Adding to 1245020143 its reverse (3410205421), we get a palindrome (4655225564).

The spelling of 1245020143 in words is "one billion, two hundred forty-five million, twenty thousand, one hundred forty-three".