2151783979 has 2 divisors, whose sum is σ = 2151783980. Its totient is φ = 2151783978.

The previous prime is 2151783961. The next prime is 2151783983. The reversal of 2151783979 is 9793871512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2151783979 - 2⁹ = 2151783467 is a prime.

It is not a weakly prime, because it can be changed into another prime (2151783379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075891989 + 1075891990.

It is an arithmetic number, because the mean of its divisors is an integer number (1075891990).

Almost surely, 2^2151783979 is an apocalyptic number.

2151783979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151783979 is an equidigital number, since it uses as much as digits as its factorization.

2151783979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 52.

The square root of 2151783979 is about 46387.3256288827. The cubic root of 2151783979 is about 1291.0197611276.

The spelling of 2151783979 in words is "two billion, one hundred fifty-one million, seven hundred eighty-three thousand, nine hundred seventy-nine".