1264122261 has 32 divisors (see below), whose sum is σ = 1985328000. Its totient is φ = 792218880.

The previous prime is 1264122257. The next prime is 1264122263. The reversal of 1264122261 is 1622214621.

1264122261 is a `hidden beast` number, since 1 + 26 + 412 + 226 + 1 = 666.

It is not a de Polignac number, because 1264122261 - 2² = 1264122257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264122263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 743190 + ... + 744888.

It is an arithmetic number, because the mean of its divisors is an integer number (62041500).

Almost surely, 2^1264122261 is an apocalyptic number.

It is an amenable number.

1264122261 is a deficient number, since it is larger than the sum of its proper divisors (721205739).

1264122261 is a wasteful number, since it uses less digits than its factorization.

1264122261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3346 (or 3340 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 1264122261 is about 35554.4970573344. The cubic root of 1264122261 is about 1081.2588946621.

Adding to 1264122261 its reverse (1622214621), we get a palindrome (2886336882).

The spelling of 1264122261 in words is "one billion, two hundred sixty-four million, one hundred twenty-two thousand, two hundred sixty-one".