245540551 has 2 divisors, whose sum is σ = 245540552. Its totient is φ = 245540550.

The previous prime is 245540543. The next prime is 245540641. The reversal of 245540551 is 155045542.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 245540551 - 2³ = 245540543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245540521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122770275 + 122770276.

It is an arithmetic number, because the mean of its divisors is an integer number (122770276).

Almost surely, 2^245540551 is an apocalyptic number.

245540551 is a deficient number, since it is larger than the sum of its proper divisors (1).

245540551 is an equidigital number, since it uses as much as digits as its factorization.

245540551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20000, while the sum is 31.

The square root of 245540551 is about 15669.7335969697. The cubic root of 245540551 is about 626.1923274420.

The spelling of 245540551 in words is "two hundred forty-five million, five hundred forty thousand, five hundred fifty-one".