1315531400 has 48 divisors (see below), whose sum is σ = 3238537140. Its totient is φ = 495257600.

The previous prime is 1315531333. The next prime is 1315531433. The reversal of 1315531400 is 41355131.

It can be written as a sum of positive squares in 6 ways, for example, as 751088836 + 564442564 = 27406^2 + 23758^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190061 + ... + 196860.

Almost surely, 2^1315531400 is an apocalyptic number.

1315531400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1315531400 is an abundant number, since it is smaller than the sum of its proper divisors (1923005740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1315531400 is a wasteful number, since it uses less digits than its factorization.

1315531400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386954 (or 386945 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1315531400 is about 36270.2550308100. The cubic root of 1315531400 is about 1095.7220622062.

Adding to 1315531400 its reverse (41355131), we get a palindrome (1356886531).

The spelling of 1315531400 in words is "one billion, three hundred fifteen million, five hundred thirty-one thousand, four hundred".