246997921 has 2 divisors, whose sum is σ = 246997922. Its totient is φ = 246997920.

The previous prime is 246997889. The next prime is 246997931. The reversal of 246997921 is 129799642.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141134400 + 105863521 = 11880^2 + 10289^2 .

It is a cyclic number.

It is not a de Polignac number, because 246997921 - 2⁵ = 246997889 is a prime.

It is a super-2 number, since 2×246997921² = 122015945956644482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (246997931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123498960 + 123498961.

It is an arithmetic number, because the mean of its divisors is an integer number (123498961).

Almost surely, 2^246997921 is an apocalyptic number.

It is an amenable number.

246997921 is a deficient number, since it is larger than the sum of its proper divisors (1).

246997921 is an equidigital number, since it uses as much as digits as its factorization.

246997921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 246997921 is about 15716.1675035614. The cubic root of 246997921 is about 627.4287753744.

The spelling of 246997921 in words is "two hundred forty-six million, nine hundred ninety-seven thousand, nine hundred twenty-one".