979891901 has 2 divisors, whose sum is σ = 979891902. Its totient is φ = 979891900.

The previous prime is 979891879. The next prime is 979891909. The reversal of 979891901 is 109198979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 820879801 + 159012100 = 28651^2 + 12610^2 .

It is a cyclic number.

It is not a de Polignac number, because 979891901 - 2¹⁴ = 979875517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (979891909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489945950 + 489945951.

It is an arithmetic number, because the mean of its divisors is an integer number (489945951).

Almost surely, 2^979891901 is an apocalyptic number.

It is an amenable number.

979891901 is a deficient number, since it is larger than the sum of its proper divisors (1).

979891901 is an equidigital number, since it uses as much as digits as its factorization.

979891901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 53.

The square root of 979891901 is about 31303.2250894377. The cubic root of 979891901 is about 993.2518654440.

The spelling of 979891901 in words is "nine hundred seventy-nine million, eight hundred ninety-one thousand, nine hundred one".