245249551 has 2 divisors, whose sum is σ = 245249552. Its totient is φ = 245249550.

The previous prime is 245249467. The next prime is 245249561. The reversal of 245249551 is 155942542.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245249551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 245249551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245249561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122624775 + 122624776.

It is an arithmetic number, because the mean of its divisors is an integer number (122624776).

Almost surely, 2^245249551 is an apocalyptic number.

245249551 is a deficient number, since it is larger than the sum of its proper divisors (1).

245249551 is an equidigital number, since it uses as much as digits as its factorization.

245249551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 37.

The square root of 245249551 is about 15660.4454278925. The cubic root of 245249551 is about 625.9448544005.

It can be divided in two parts, 2452 and 49551, that added together give a triangular number (52003 = T₃₂₂).

The spelling of 245249551 in words is "two hundred forty-five million, two hundred forty-nine thousand, five hundred fifty-one".