2051551291 has 2 divisors, whose sum is σ = 2051551292. Its totient is φ = 2051551290.

The previous prime is 2051551241. The next prime is 2051551303. The reversal of 2051551291 is 1921551502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2051551291 - 2¹⁵ = 2051518523 is a prime.

It is not a weakly prime, because it can be changed into another prime (2051551241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025775645 + 1025775646.

It is an arithmetic number, because the mean of its divisors is an integer number (1025775646).

Almost surely, 2^2051551291 is an apocalyptic number.

2051551291 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051551291 is an equidigital number, since it uses as much as digits as its factorization.

2051551291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 31.

The square root of 2051551291 is about 45294.0535942633. The cubic root of 2051551291 is about 1270.6544441498.

The spelling of 2051551291 in words is "two billion, fifty-one million, five hundred fifty-one thousand, two hundred ninety-one".