246721861 has 2 divisors, whose sum is σ = 246721862. Its totient is φ = 246721860.

The previous prime is 246721841. The next prime is 246721877. The reversal of 246721861 is 168127642.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245893761 + 828100 = 15681^2 + 910^2 .

It is a cyclic number.

It is not a de Polignac number, because 246721861 - 2⁵ = 246721829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 246721861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (246721841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123360930 + 123360931.

It is an arithmetic number, because the mean of its divisors is an integer number (123360931).

Almost surely, 2^246721861 is an apocalyptic number.

It is an amenable number.

246721861 is a deficient number, since it is larger than the sum of its proper divisors (1).

246721861 is an equidigital number, since it uses as much as digits as its factorization.

246721861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 246721861 is about 15707.3823726298. The cubic root of 246721861 is about 627.1949372967.

The spelling of 246721861 in words is "two hundred forty-six million, seven hundred twenty-one thousand, eight hundred sixty-one".