1243520002 has 4 divisors (see below), whose sum is σ = 1865280006. Its totient is φ = 621760000.

The previous prime is 1243519951. The next prime is 1243520009. The reversal of 1243520002 is 2000253421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2000253421 = 191 ⋅10472531.

It can be written as a sum of positive squares in only one way, i.e., 625550121 + 617969881 = 25011^2 + 24859^2 .

It is not an unprimeable number, because it can be changed into a prime (1243520009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310879999 + ... + 310880002.

Almost surely, 2^1243520002 is an apocalyptic number.

1243520002 is a deficient number, since it is larger than the sum of its proper divisors (621760004).

1243520002 is an equidigital number, since it uses as much as digits as its factorization.

1243520002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621760003.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 1243520002 is about 35263.5789732126. The cubic root of 1243520002 is about 1075.3526881707.

Adding to 1243520002 its reverse (2000253421), we get a palindrome (3243773423).

The spelling of 1243520002 in words is "one billion, two hundred forty-three million, five hundred twenty thousand, two".