2991915551 has 2 divisors, whose sum is σ = 2991915552. Its totient is φ = 2991915550.

The previous prime is 2991915517. The next prime is 2991915569. The reversal of 2991915551 is 1555191992.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2991915551 - 2¹⁸ = 2991653407 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 2991915496 and 2991915505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2991975551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495957775 + 1495957776.

It is an arithmetic number, because the mean of its divisors is an integer number (1495957776).

Almost surely, 2^2991915551 is an apocalyptic number.

2991915551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991915551 is an equidigital number, since it uses as much as digits as its factorization.

2991915551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 182250, while the sum is 47.

The square root of 2991915551 is about 54698.4053789505. The cubic root of 2991915551 is about 1440.9528722550.

The spelling of 2991915551 in words is "two billion, nine hundred ninety-one million, nine hundred fifteen thousand, five hundred fifty-one".