1315400650 has 12 divisors (see below), whose sum is σ = 2446645302. Its totient is φ = 526160240.

The previous prime is 1315400641. The next prime is 1315400657. The reversal of 1315400650 is 560045131.

It can be written as a sum of positive squares in 3 ways, for example, as 699020721 + 616379929 = 26439^2 + 24827^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1315400657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13153957 + ... + 13154056.

Almost surely, 2^1315400650 is an apocalyptic number.

1315400650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1315400650 is a deficient number, since it is larger than the sum of its proper divisors (1131244652).

1315400650 is a wasteful number, since it uses less digits than its factorization.

1315400650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26308025 (or 26308020 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1315400650 is about 36268.4525448771. The cubic root of 1315400650 is about 1095.6857599165.

Adding to 1315400650 its reverse (560045131), we get a palindrome (1875445781).

The spelling of 1315400650 in words is "one billion, three hundred fifteen million, four hundred thousand, six hundred fifty".