1224640657 has 2 divisors, whose sum is σ = 1224640658. Its totient is φ = 1224640656.

The previous prime is 1224640633. The next prime is 1224640717. The reversal of 1224640657 is 7560464221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 633226896 + 591413761 = 25164^2 + 24319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1224640657 is a prime.

It is a super-3 number, since 3×1224640657³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1224640607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612320328 + 612320329.

It is an arithmetic number, because the mean of its divisors is an integer number (612320329).

Almost surely, 2^1224640657 is an apocalyptic number.

It is an amenable number.

1224640657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224640657 is an equidigital number, since it uses as much as digits as its factorization.

1224640657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 1224640657 is about 34994.8661520515. The cubic root of 1224640657 is about 1069.8828465207.

The spelling of 1224640657 in words is "one billion, two hundred twenty-four million, six hundred forty thousand, six hundred fifty-seven".