1226540615 has 4 divisors (see below), whose sum is σ = 1471848744. Its totient is φ = 981232488.

The previous prime is 1226540569. The next prime is 1226540617. The reversal of 1226540615 is 5160456221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5160456221 = 19 ⋅271602959.

It is a cyclic number.

It is not a de Polignac number, because 1226540615 - 2²² = 1222346311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226540617) 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, 122654057 + ... + 122654066.

It is an arithmetic number, because the mean of its divisors is an integer number (367962186).

Almost surely, 2^1226540615 is an apocalyptic number.

1226540615 is a deficient number, since it is larger than the sum of its proper divisors (245308129).

1226540615 is an equidigital number, since it uses as much as digits as its factorization.

1226540615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245308128.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1226540615 is about 35022.0018702529. The cubic root of 1226540615 is about 1070.4358474208.

Adding to 1226540615 its reverse (5160456221), we get a palindrome (6386996836).

The spelling of 1226540615 in words is "one billion, two hundred twenty-six million, five hundred forty thousand, six hundred fifteen".