1349157409 has 2 divisors, whose sum is σ = 1349157410. Its totient is φ = 1349157408.

The previous prime is 1349157373. The next prime is 1349157463. The reversal of 1349157409 is 9047519431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929030400 + 420127009 = 30480^2 + 20497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1349157409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1349157499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 674578704 + 674578705.

It is an arithmetic number, because the mean of its divisors is an integer number (674578705).

Almost surely, 2^1349157409 is an apocalyptic number.

It is an amenable number.

1349157409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1349157409 is an equidigital number, since it uses as much as digits as its factorization.

1349157409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 1349157409 is about 36730.8781408776. The cubic root of 1349157409 is about 1104.9794660503.

The spelling of 1349157409 in words is "one billion, three hundred forty-nine million, one hundred fifty-seven thousand, four hundred nine".