1331220269 has 2 divisors, whose sum is σ = 1331220270. Its totient is φ = 1331220268.

The previous prime is 1331220181. The next prime is 1331220301. The reversal of 1331220269 is 9620221331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 808549225 + 522671044 = 28435^2 + 22862^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331220269 - 2¹⁶ = 1331154733 is a prime.

It is a super-2 number, since 2×1331220269² = 3544294809192864722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331220169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665610134 + 665610135.

It is an arithmetic number, because the mean of its divisors is an integer number (665610135).

Almost surely, 2^1331220269 is an apocalyptic number.

It is an amenable number.

1331220269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331220269 is an equidigital number, since it uses as much as digits as its factorization.

1331220269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1331220269 is about 36485.8913691306. The cubic root of 1331220269 is about 1100.0606768182.

The spelling of 1331220269 in words is "one billion, three hundred thirty-one million, two hundred twenty thousand, two hundred sixty-nine".