1263221015 has 32 divisors (see below), whose sum is σ = 1815097344. Its totient is φ = 825707520.

The previous prime is 1263220993. The next prime is 1263221017. The reversal of 1263221015 is 5101223621.

It is not a de Polignac number, because 1263221015 - 2⁶ = 1263220951 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 (1263221017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64007 + ... + 81383.

It is an arithmetic number, because the mean of its divisors is an integer number (56721792).

Almost surely, 2^1263221015 is an apocalyptic number.

1263221015 is a deficient number, since it is larger than the sum of its proper divisors (551876329).

1263221015 is a wasteful number, since it uses less digits than its factorization.

1263221015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17487.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1263221015 is about 35541.8206483573. The cubic root of 1263221015 is about 1081.0018752376.

Adding to 1263221015 its reverse (5101223621), we get a palindrome (6364444636).

The spelling of 1263221015 in words is "one billion, two hundred sixty-three million, two hundred twenty-one thousand, fifteen".