1225620865 has 32 divisors (see below), whose sum is σ = 1809941760. Its totient is φ = 777560064.

The previous prime is 1225620857. The next prime is 1225620917. The reversal of 1225620865 is 5680265221.

It is a cyclic number.

It is not a de Polignac number, because 1225620865 - 2³ = 1225620857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17649 + ... + 52561.

It is an arithmetic number, because the mean of its divisors is an integer number (56560680).

Almost surely, 2^1225620865 is an apocalyptic number.

It is an amenable number.

1225620865 is a deficient number, since it is larger than the sum of its proper divisors (584320895).

1225620865 is a wasteful number, since it uses less digits than its factorization.

1225620865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35001.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 1225620865 is about 35008.8683764557. The cubic root of 1225620865 is about 1070.1682167765.

The spelling of 1225620865 in words is "one billion, two hundred twenty-five million, six hundred twenty thousand, eight hundred sixty-five".