2991387653 has 2 divisors, whose sum is σ = 2991387654. Its totient is φ = 2991387652.

The previous prime is 2991387617. The next prime is 2991387689. The reversal of 2991387653 is 3567831992.

It is a balanced prime because it is at equal distance from previous prime (2991387617) and next prime (2991387689).

It can be written as a sum of positive squares in only one way, i.e., 1738723204 + 1252664449 = 41698^2 + 35393^2 .

It is a cyclic number.

It is not a de Polignac number, because 2991387653 - 2⁶ = 2991387589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2991387595 and 2991387604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2991387053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495693826 + 1495693827.

It is an arithmetic number, because the mean of its divisors is an integer number (1495693827).

Almost surely, 2^2991387653 is an apocalyptic number.

It is an amenable number.

2991387653 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991387653 is an equidigital number, since it uses as much as digits as its factorization.

2991387653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 53.

The square root of 2991387653 is about 54693.5796323481. The cubic root of 2991387653 is about 1440.8681193189.

The spelling of 2991387653 in words is "two billion, nine hundred ninety-one million, three hundred eighty-seven thousand, six hundred fifty-three".