2151345247 has 4 divisors (see below), whose sum is σ = 2153296800. Its totient is φ = 2149393696.

The previous prime is 2151345233. The next prime is 2151345263. The reversal of 2151345247 is 7425431512.

2151345247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2151345247 - 2¹⁵ = 2151312479 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 (2151345047) 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, 974122 + ... + 976327.

It is an arithmetic number, because the mean of its divisors is an integer number (538324200).

Almost surely, 2^2151345247 is an apocalyptic number.

2151345247 is a deficient number, since it is larger than the sum of its proper divisors (1951553).

2151345247 is a wasteful number, since it uses less digits than its factorization.

2151345247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951552.

The product of its digits is 33600, while the sum is 34.

The square root of 2151345247 is about 46382.5963805391. The cubic root of 2151345247 is about 1290.9320122043.

Adding to 2151345247 its reverse (7425431512), we get a palindrome (9576776759).

The spelling of 2151345247 in words is "two billion, one hundred fifty-one million, three hundred forty-five thousand, two hundred forty-seven".