1979851231 has 2 divisors, whose sum is σ = 1979851232. Its totient is φ = 1979851230.

The previous prime is 1979851213. The next prime is 1979851249. The reversal of 1979851231 is 1321589791.

Together with previous prime (1979851213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (1979851213) and next prime (1979851249).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1979851231 is a prime.

It is a super-2 number, since 2×1979851231² = 7839621793784430722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1979851631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989925615 + 989925616.

It is an arithmetic number, because the mean of its divisors is an integer number (989925616).

Almost surely, 2^1979851231 is an apocalyptic number.

1979851231 is the 25690-th hex number.

1979851231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979851231 is an equidigital number, since it uses as much as digits as its factorization.

1979851231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 46.

The square root of 1979851231 is about 44495.5192238499. The cubic root of 1979851231 is about 1255.6757853091.

The spelling of 1979851231 in words is "one billion, nine hundred seventy-nine million, eight hundred fifty-one thousand, two hundred thirty-one".