1264542261 has 16 divisors (see below), whose sum is σ = 1715003328. Its totient is φ = 828576000.

The previous prime is 1264542259. The next prime is 1264542269. The reversal of 1264542261 is 1622454621.

It is not a de Polignac number, because 1264542261 - 2¹ = 1264542259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264542269) 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 15 ways as a sum of consecutive naturals, for example, 450061 + ... + 452861.

It is an arithmetic number, because the mean of its divisors is an integer number (107187708).

Almost surely, 2^1264542261 is an apocalyptic number.

It is an amenable number.

1264542261 is a deficient number, since it is larger than the sum of its proper divisors (450461067).

1264542261 is a wasteful number, since it uses less digits than its factorization.

1264542261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5332.

The product of its digits is 23040, while the sum is 33.

The square root of 1264542261 is about 35560.4029926546. The cubic root of 1264542261 is about 1081.3786295076.

Adding to 1264542261 its reverse (1622454621), we get a palindrome (2886996882).

The spelling of 1264542261 in words is "one billion, two hundred sixty-four million, five hundred forty-two thousand, two hundred sixty-one".