1331222001 has 16 divisors (see below), whose sum is σ = 1837307904. Its totient is φ = 856687104.

The previous prime is 1331221987. The next prime is 1331222021. The reversal of 1331222001 is 1002221331.

It is not a de Polignac number, because 1331222001 - 2¹⁰ = 1331220977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1331222021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33120 + ... + 61313.

It is an arithmetic number, because the mean of its divisors is an integer number (114831744).

Almost surely, 2^1331222001 is an apocalyptic number.

It is an amenable number.

1331222001 is a deficient number, since it is larger than the sum of its proper divisors (506085903).

1331222001 is a wasteful number, since it uses less digits than its factorization.

1331222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94600.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1331222001 is about 36485.9151043248. The cubic root of 1331222001 is about 1100.0611539004.

Adding to 1331222001 its reverse (1002221331), we get a palindrome (2333443332).

The spelling of 1331222001 in words is "one billion, three hundred thirty-one million, two hundred twenty-two thousand, one".