245177993 has 2 divisors, whose sum is σ = 245177994. Its totient is φ = 245177992.

The previous prime is 245177987. The next prime is 245178049. The reversal of 245177993 is 399771542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214563904 + 30614089 = 14648^2 + 5533^2 .

It is a cyclic number.

It is not a de Polignac number, because 245177993 - 2⁶ = 245177929 is a prime.

It is a super-2 number, since 2×245177993² = 120224496503016098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (245177293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122588996 + 122588997.

It is an arithmetic number, because the mean of its divisors is an integer number (122588997).

Almost surely, 2^245177993 is an apocalyptic number.

It is an amenable number.

245177993 is a deficient number, since it is larger than the sum of its proper divisors (1).

245177993 is an equidigital number, since it uses as much as digits as its factorization.

245177993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 47.

The square root of 245177993 is about 15658.1605880129. The cubic root of 245177993 is about 625.8839698596.

The spelling of 245177993 in words is "two hundred forty-five million, one hundred seventy-seven thousand, nine hundred ninety-three".