2651391243 has 6 divisors (see below), whose sum is σ = 3829787364. Its totient is φ = 1767594156.

The previous prime is 2651391241. The next prime is 2651391287. The reversal of 2651391243 is 3421931562.

2651391243 is a `hidden beast` number, since 26 + 5 + 1 + 391 + 243 = 666.

It is not a de Polignac number, because 2651391243 - 2¹ = 2651391241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2651391198 and 2651391207.

It is not an unprimeable number, because it can be changed into a prime (2651391241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 147299505 + ... + 147299522.

It is an arithmetic number, because the mean of its divisors is an integer number (638297894).

Almost surely, 2^2651391243 is an apocalyptic number.

2651391243 is a deficient number, since it is larger than the sum of its proper divisors (1178396121).

2651391243 is a wasteful number, since it uses less digits than its factorization.

2651391243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294599033 (or 294599030 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 2651391243 is about 51491.6618784051. The cubic root of 2651391243 is about 1384.0696298722.

The spelling of 2651391243 in words is "two billion, six hundred fifty-one million, three hundred ninety-one thousand, two hundred forty-three".