1243061642 has 4 divisors (see below), whose sum is σ = 1864592466. Its totient is φ = 621530820.

The previous prime is 1243061621. The next prime is 1243061671. The reversal of 1243061642 is 2461603421.

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

It can be written as a sum of positive squares in only one way, i.e., 629558281 + 613503361 = 25091^2 + 24769^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310765409 + ... + 310765412.

Almost surely, 2^1243061642 is an apocalyptic number.

1243061642 is a deficient number, since it is larger than the sum of its proper divisors (621530824).

1243061642 is an equidigital number, since it uses as much as digits as its factorization.

1243061642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621530823.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 1243061642 is about 35257.0793174931. The cubic root of 1243061642 is about 1075.2205473580.

The spelling of 1243061642 in words is "one billion, two hundred forty-three million, sixty-one thousand, six hundred forty-two".