1201540642 has 8 divisors (see below), whose sum is σ = 1820155932. Its totient is φ = 594822000.

The previous prime is 1201540609. The next prime is 1201540643. The reversal of 1201540642 is 2460451021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1191561361 + 9979281 = 34519^2 + 3159^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1201540643) 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, 2973909 + ... + 2974312.

Almost surely, 2^1201540642 is an apocalyptic number.

1201540642 is a deficient number, since it is larger than the sum of its proper divisors (618615290).

1201540642 is a wasteful number, since it uses less digits than its factorization.

1201540642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5948324.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1201540642 is about 34663.2462703654. The cubic root of 1201540642 is about 1063.1131459279.

Adding to 1201540642 its reverse (2460451021), we get a palindrome (3661991663).

The spelling of 1201540642 in words is "one billion, two hundred one million, five hundred forty thousand, six hundred forty-two".