1201540641 has 8 divisors (see below), whose sum is σ = 1830919104. Its totient is φ = 686594640.

The previous prime is 1201540609. The next prime is 1201540643. The reversal of 1201540641 is 1460451021.

It is a happy number.

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

It is not a de Polignac number, because 1201540641 - 2⁵ = 1201540609 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 28608090 + ... + 28608131.

It is an arithmetic number, because the mean of its divisors is an integer number (228864888).

Almost surely, 2^1201540641 is an apocalyptic number.

It is an amenable number.

1201540641 is a deficient number, since it is larger than the sum of its proper divisors (629378463).

1201540641 is an equidigital number, since it uses as much as digits as its factorization.

1201540641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57216231.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1201540641 is about 34663.2462559409. The cubic root of 1201540641 is about 1063.1131456330.

Adding to 1201540641 its reverse (1460451021), we get a palindrome (2661991662).

The spelling of 1201540641 in words is "one billion, two hundred one million, five hundred forty thousand, six hundred forty-one".