1236061642 has 4 divisors (see below), whose sum is σ = 1854092466. Its totient is φ = 618030820.

The previous prime is 1236061633. The next prime is 1236061643. The reversal of 1236061642 is 2461606321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2461606321 = 1031 ⋅2387591.

It can be written as a sum of positive squares in only one way, i.e., 1102173601 + 133888041 = 33199^2 + 11571^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1236061643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309015409 + ... + 309015412.

Almost surely, 2^1236061642 is an apocalyptic number.

1236061642 is a deficient number, since it is larger than the sum of its proper divisors (618030824).

1236061642 is an equidigital number, since it uses as much as digits as its factorization.

1236061642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618030823.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 1236061642 is about 35157.6683242788. The cubic root of 1236061642 is about 1073.1984657731.

Adding to 1236061642 its reverse (2461606321), we get a palindrome (3697667963).

The spelling of 1236061642 in words is "one billion, two hundred thirty-six million, sixty-one thousand, six hundred forty-two".