1310221999 has 2 divisors, whose sum is σ = 1310222000. Its totient is φ = 1310221998.

The previous prime is 1310221987. The next prime is 1310222003. The reversal of 1310221999 is 9991220131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1310221999 - 2¹¹ = 1310219951 is a prime.

It is a super-3 number, since 3×1310221999³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1310221949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655110999 + 655111000.

It is an arithmetic number, because the mean of its divisors is an integer number (655111000).

Almost surely, 2^1310221999 is an apocalyptic number.

1310221999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1310221999 is an equidigital number, since it uses as much as digits as its factorization.

1310221999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 1310221999 is about 36196.9888112257. The cubic root of 1310221999 is about 1094.2459864714.

The spelling of 1310221999 in words is "one billion, three hundred ten million, two hundred twenty-one thousand, nine hundred ninety-nine".