1349735921 has 2 divisors, whose sum is σ = 1349735922. Its totient is φ = 1349735920.

The previous prime is 1349735903. The next prime is 1349735929. The reversal of 1349735921 is 1295379431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1248632896 + 101103025 = 35336^2 + 10055^2 .

It is an emirp because it is prime and its reverse (1295379431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1349735921 - 2³⁰ = 275994097 is a prime.

It is not a weakly prime, because it can be changed into another prime (1349735929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 674867960 + 674867961.

It is an arithmetic number, because the mean of its divisors is an integer number (674867961).

Almost surely, 2^1349735921 is an apocalyptic number.

It is an amenable number.

1349735921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1349735921 is an equidigital number, since it uses as much as digits as its factorization.

1349735921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 44.

The square root of 1349735921 is about 36738.7523059779. The cubic root of 1349735921 is about 1105.1373800516.

The spelling of 1349735921 in words is "one billion, three hundred forty-nine million, seven hundred thirty-five thousand, nine hundred twenty-one".