1315252551 has 4 divisors (see below), whose sum is σ = 1753670072. Its totient is φ = 876835032.

The previous prime is 1315252541. The next prime is 1315252553. The reversal of 1315252551 is 1552525131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1315252551 - 2²² = 1311058247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315252553) 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, 219208756 + ... + 219208761.

It is an arithmetic number, because the mean of its divisors is an integer number (438417518).

Almost surely, 2^1315252551 is an apocalyptic number.

1315252551 is a deficient number, since it is larger than the sum of its proper divisors (438417521).

1315252551 is an equidigital number, since it uses as much as digits as its factorization.

1315252551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438417520.

The product of its digits is 7500, while the sum is 30.

The square root of 1315252551 is about 36266.4107818791. The cubic root of 1315252551 is about 1095.6446378305.

Adding to 1315252551 its reverse (1552525131), we get a palindrome (2867777682).

It can be divided in two parts, 13152 and 52551, that added together give a triangular number (65703 = T₃₆₂).

The spelling of 1315252551 in words is "one billion, three hundred fifteen million, two hundred fifty-two thousand, five hundred fifty-one".