1225999969 has 16 divisors (see below), whose sum is σ = 1295726400. Its totient is φ = 1158341184.

The previous prime is 1225999937. The next prime is 1225999991. The reversal of 1225999969 is 9699995221.

It is a cyclic number.

It is not a de Polignac number, because 1225999969 - 2⁵ = 1225999937 is a prime.

It is a super-2 number, since 2×1225999969² = 3006151847976001922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1225999919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303042 + ... + 307060.

It is an arithmetic number, because the mean of its divisors is an integer number (80982900).

Almost surely, 2^1225999969 is an apocalyptic number.

It is an amenable number.

1225999969 is a deficient number, since it is larger than the sum of its proper divisors (69726431).

1225999969 is a wasteful number, since it uses less digits than its factorization.

1225999969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4272.

The product of its digits is 7085880, while the sum is 61.

The square root of 1225999969 is about 35014.2823573467. The cubic root of 1225999969 is about 1070.2785454108.

The spelling of 1225999969 in words is "one billion, two hundred twenty-five million, nine hundred ninety-nine thousand, nine hundred sixty-nine".