1315021551 has 16 divisors (see below), whose sum is σ = 1803753600. Its totient is φ = 851564448.

The previous prime is 1315021549. The next prime is 1315021579. The reversal of 1315021551 is 1551205131.

It is not a de Polignac number, because 1315021551 - 2¹ = 1315021549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315021751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59140 + ... + 78278.

It is an arithmetic number, because the mean of its divisors is an integer number (112734600).

Almost surely, 2^1315021551 is an apocalyptic number.

1315021551 is a deficient number, since it is larger than the sum of its proper divisors (488732049).

1315021551 is a wasteful number, since it uses less digits than its factorization.

1315021551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19798.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 1315021551 is about 36263.2258769128. The cubic root of 1315021551 is about 1095.5804907764.

Adding to 1315021551 its reverse (1551205131), we get a palindrome (2866226682).

The spelling of 1315021551 in words is "one billion, three hundred fifteen million, twenty-one thousand, five hundred fifty-one".