245977993 has 2 divisors, whose sum is σ = 245977994. Its totient is φ = 245977992.

The previous prime is 245977973. The next prime is 245978027. The reversal of 245977993 is 399779542.

245977993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192571129 + 53406864 = 13877^2 + 7308^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245977993 is a prime.

It is not a weakly prime, because it can be changed into another prime (245977973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122988996 + 122988997.

It is an arithmetic number, because the mean of its divisors is an integer number (122988997).

Almost surely, 2^245977993 is an apocalyptic number.

It is an amenable number.

245977993 is a deficient number, since it is larger than the sum of its proper divisors (1).

245977993 is an equidigital number, since it uses as much as digits as its factorization.

245977993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4286520, while the sum is 55.

The square root of 245977993 is about 15683.6855681310. The cubic root of 245977993 is about 626.5639704897.

The spelling of 245977993 in words is "two hundred forty-five million, nine hundred seventy-seven thousand, nine hundred ninety-three".