2315211551 has 4 divisors (see below), whose sum is σ = 2315400504. Its totient is φ = 2315022600.

The previous prime is 2315211539. The next prime is 2315211559. The reversal of 2315211551 is 1551125132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2315211551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2315211551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2315211559) 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, 74720 + ... + 101061.

It is an arithmetic number, because the mean of its divisors is an integer number (578850126).

Almost surely, 2^2315211551 is an apocalyptic number.

2315211551 is a deficient number, since it is larger than the sum of its proper divisors (188953).

2315211551 is a wasteful number, since it uses less digits than its factorization.

2315211551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188952.

The product of its digits is 1500, while the sum is 26.

The square root of 2315211551 is about 48116.6452592032. The cubic root of 2315211551 is about 1322.9097791889.

Adding to 2315211551 its reverse (1551125132), we get a palindrome (3866336683).

The spelling of 2315211551 in words is "two billion, three hundred fifteen million, two hundred eleven thousand, five hundred fifty-one".