1225727761 has 8 divisors (see below), whose sum is σ = 1298367360. Its totient is φ = 1153147968.

The previous prime is 1225727747. The next prime is 1225727801. The reversal of 1225727761 is 1677275221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1225727761 - 2¹⁵ = 1225694993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225727561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31380 + ... + 58618.

It is an arithmetic number, because the mean of its divisors is an integer number (162295920).

Almost surely, 2^1225727761 is an apocalyptic number.

It is an amenable number.

1225727761 is a deficient number, since it is larger than the sum of its proper divisors (72639599).

1225727761 is a wasteful number, since it uses less digits than its factorization.

1225727761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29903.

The product of its digits is 82320, while the sum is 40.

The square root of 1225727761 is about 35010.3950420443. The cubic root of 1225727761 is about 1070.1993284575.

The spelling of 1225727761 in words is "one billion, two hundred twenty-five million, seven hundred twenty-seven thousand, seven hundred sixty-one".