1226156501 has 4 divisors (see below), whose sum is σ = 1298283372. Its totient is φ = 1154029632.

The previous prime is 1226156497. The next prime is 1226156521. The reversal of 1226156501 is 1056516221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 964040401 + 262116100 = 31049^2 + 16190^2 .

It is not a de Polignac number, because 1226156501 - 2² = 1226156497 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 (1226156521) 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, 36063410 + ... + 36063443.

It is an arithmetic number, because the mean of its divisors is an integer number (324570843).

Almost surely, 2^1226156501 is an apocalyptic number.

It is an amenable number.

1226156501 is a deficient number, since it is larger than the sum of its proper divisors (72126871).

1226156501 is an equidigital number, since it uses as much as digits as its factorization.

1226156501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72126870.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1226156501 is about 35016.5175452957. The cubic root of 1226156501 is about 1070.3240934575.

The spelling of 1226156501 in words is "one billion, two hundred twenty-six million, one hundred fifty-six thousand, five hundred one".