1264242551 has 8 divisors (see below), whose sum is σ = 1485264144. Its totient is φ = 1060902720.

The previous prime is 1264242547. The next prime is 1264242571. The reversal of 1264242551 is 1552424621.

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

It is a cyclic number.

It is not a de Polignac number, because 1264242551 - 2² = 1264242547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264242521) 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, 4420286 + ... + 4420571.

It is an arithmetic number, because the mean of its divisors is an integer number (185658018).

Almost surely, 2^1264242551 is an apocalyptic number.

1264242551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1264242551 is a deficient number, since it is larger than the sum of its proper divisors (221021593).

1264242551 is a wasteful number, since it uses less digits than its factorization.

1264242551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8840881.

The product of its digits is 19200, while the sum is 32.

The square root of 1264242551 is about 35556.1886455790. The cubic root of 1264242551 is about 1081.2931900019.

The spelling of 1264242551 in words is "one billion, two hundred sixty-four million, two hundred forty-two thousand, five hundred fifty-one".