1226657621 has 12 divisors (see below), whose sum is σ = 1428504588. Its totient is φ = 1050259392.

The previous prime is 1226657611. The next prime is 1226657629. The reversal of 1226657621 is 1267566221.

It can be written as a sum of positive squares in 2 ways, for example, as 141943396 + 1084714225 = 11914^2 + 32935^2 .

It is not a de Polignac number, because 1226657621 - 2¹⁸ = 1226395477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226657629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32555 + ... + 59271.

It is an arithmetic number, because the mean of its divisors is an integer number (119042049).

Almost surely, 2^1226657621 is an apocalyptic number.

It is an amenable number.

1226657621 is a deficient number, since it is larger than the sum of its proper divisors (201846967).

1226657621 is an equidigital number, since it uses as much as digits as its factorization.

1226657621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27668 (or 27661 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 1226657621 is about 35023.6722946067. The cubic root of 1226657621 is about 1070.4698844603.

The spelling of 1226657621 in words is "one billion, two hundred twenty-six million, six hundred fifty-seven thousand, six hundred twenty-one".