1226561741 has 4 divisors (see below), whose sum is σ = 1228651872. Its totient is φ = 1224471612.

The previous prime is 1226561737. The next prime is 1226561753. The reversal of 1226561741 is 1471656221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1226561741 - 2² = 1226561737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226561711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1044185 + ... + 1045358.

It is an arithmetic number, because the mean of its divisors is an integer number (307162968).

Almost surely, 2^1226561741 is an apocalyptic number.

It is an amenable number.

1226561741 is a deficient number, since it is larger than the sum of its proper divisors (2090131).

1226561741 is an equidigital number, since it uses as much as digits as its factorization.

1226561741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090130.

The product of its digits is 20160, while the sum is 35.

The square root of 1226561741 is about 35022.3034793544. The cubic root of 1226561741 is about 1070.4419931332.

The spelling of 1226561741 in words is "one billion, two hundred twenty-six million, five hundred sixty-one thousand, seven hundred forty-one".