1263212645 has 8 divisors (see below), whose sum is σ = 1564753920. Its totient is φ = 977970960.

The previous prime is 1263212641. The next prime is 1263212651. The reversal of 1263212645 is 5462123621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1263212645 - 2² = 1263212641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263212641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4074725 + ... + 4075034.

It is an arithmetic number, because the mean of its divisors is an integer number (195594240).

Almost surely, 2^1263212645 is an apocalyptic number.

It is an amenable number.

1263212645 is a deficient number, since it is larger than the sum of its proper divisors (301541275).

1263212645 is an equidigital number, since it uses as much as digits as its factorization.

1263212645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8149795.

The product of its digits is 17280, while the sum is 32.

The square root of 1263212645 is about 35541.7028995517. The cubic root of 1263212645 is about 1080.9994876887. Note that the first 3 decimals are identical.

The spelling of 1263212645 in words is "one billion, two hundred sixty-three million, two hundred twelve thousand, six hundred forty-five".