1999772051 has 2 divisors, whose sum is σ = 1999772052. Its totient is φ = 1999772050.

The previous prime is 1999772029. The next prime is 1999772063. The reversal of 1999772051 is 1502779991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1999772051 - 2¹⁰ = 1999771027 is a prime.

It is not a weakly prime, because it can be changed into another prime (1999772251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999886025 + 999886026.

It is an arithmetic number, because the mean of its divisors is an integer number (999886026).

Almost surely, 2^1999772051 is an apocalyptic number.

1999772051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999772051 is an equidigital number, since it uses as much as digits as its factorization.

1999772051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 357210, while the sum is 50.

The square root of 1999772051 is about 44718.8109300773. The cubic root of 1999772051 is about 1259.8731817857.

The spelling of 1999772051 in words is "one billion, nine hundred ninety-nine million, seven hundred seventy-two thousand, fifty-one".