1201333541 has 4 divisors (see below), whose sum is σ = 1201788000. Its totient is φ = 1200879084.

The previous prime is 1201333499. The next prime is 1201333589. The reversal of 1201333541 is 1453331021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1453331021 = 71 ⋅20469451.

It is a cyclic number.

It is not a de Polignac number, because 1201333541 - 2⁶ = 1201333477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201333591) 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, 223241 + ... + 228558.

It is an arithmetic number, because the mean of its divisors is an integer number (300447000).

Almost surely, 2^1201333541 is an apocalyptic number.

It is an amenable number.

1201333541 is a deficient number, since it is larger than the sum of its proper divisors (454459).

1201333541 is an equidigital number, since it uses as much as digits as its factorization.

1201333541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454458.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1201333541 is about 34660.2588132287. The cubic root of 1201333541 is about 1063.0520620053.

Adding to 1201333541 its reverse (1453331021), we get a palindrome (2654664562).

It can be divided in two parts, 12013 and 33541, that added together give a palindrome (45554).

The spelling of 1201333541 in words is "one billion, two hundred one million, three hundred thirty-three thousand, five hundred forty-one".