245547521 has 2 divisors, whose sum is σ = 245547522. Its totient is φ = 245547520.

The previous prime is 245547427. The next prime is 245547539. The reversal of 245547521 is 125745542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196000000 + 49547521 = 14000^2 + 7039^2 .

It is a cyclic number.

It is not a de Polignac number, because 245547521 - 2¹⁴ = 245531137 is a prime.

It is a Chen prime.

It is equal to p_13449077 and since 245547521 and 13449077 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (245547581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122773760 + 122773761.

It is an arithmetic number, because the mean of its divisors is an integer number (122773761).

Almost surely, 2^245547521 is an apocalyptic number.

It is an amenable number.

245547521 is a deficient number, since it is larger than the sum of its proper divisors (1).

245547521 is an equidigital number, since it uses as much as digits as its factorization.

245547521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56000, while the sum is 35.

The square root of 245547521 is about 15669.9559986619. The cubic root of 245547521 is about 626.1982524908.

The spelling of 245547521 in words is "two hundred forty-five million, five hundred forty-seven thousand, five hundred twenty-one".