1226561641 has 8 divisors (see below), whose sum is σ = 1324025280. Its totient is φ = 1132775952.

The previous prime is 1226561603. The next prime is 1226561653. The reversal of 1226561641 is 1461656221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1226561641 is a prime.

It is a super-2 number, since 2×1226561641² = 3008906918345225762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1226561597 and 1226561606.

It is not an unprimeable number, because it can be changed into a prime (1226561671) 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, 918795 + ... + 920128.

It is an arithmetic number, because the mean of its divisors is an integer number (165503160).

Almost surely, 2^1226561641 is an apocalyptic number.

It is an amenable number.

1226561641 is a deficient number, since it is larger than the sum of its proper divisors (97463639).

1226561641 is a wasteful number, since it uses less digits than its factorization.

1226561641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1838975.

The product of its digits is 17280, while the sum is 34.

The square root of 1226561641 is about 35022.3020516927. The cubic root of 1226561641 is about 1070.4419640426.

The spelling of 1226561641 in words is "one billion, two hundred twenty-six million, five hundred sixty-one thousand, six hundred forty-one".