1315356649 has 4 divisors (see below), whose sum is σ = 1316039760. Its totient is φ = 1314673540.

The previous prime is 1315356631. The next prime is 1315356667. The reversal of 1315356649 is 9466535131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1315356631) and next prime (1315356667).

It is a cyclic number.

It is not a de Polignac number, because 1315356649 - 2¹⁹ = 1314832361 is a prime.

It is a super-2 number, since 2×1315356649² = 3460326228137018402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315356689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338659 + ... + 342520.

It is an arithmetic number, because the mean of its divisors is an integer number (329009940).

Almost surely, 2^1315356649 is an apocalyptic number.

It is an amenable number.

1315356649 is a deficient number, since it is larger than the sum of its proper divisors (683111).

1315356649 is an equidigital number, since it uses as much as digits as its factorization.

1315356649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683110.

The product of its digits is 291600, while the sum is 43.

The square root of 1315356649 is about 36267.8459382412. The cubic root of 1315356649 is about 1095.6735426485.

The spelling of 1315356649 in words is "one billion, three hundred fifteen million, three hundred fifty-six thousand, six hundred forty-nine".