1264061551 has 4 divisors (see below), whose sum is σ = 1264929400. Its totient is φ = 1263193704.

The previous prime is 1264061521. The next prime is 1264061563. The reversal of 1264061551 is 1551604621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264061551 is a prime.

It is a super-3 number, since 3×1264061551³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264061521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431736 + ... + 434653.

It is an arithmetic number, because the mean of its divisors is an integer number (316232350).

Almost surely, 2^1264061551 is an apocalyptic number.

1264061551 is a deficient number, since it is larger than the sum of its proper divisors (867849).

1264061551 is an equidigital number, since it uses as much as digits as its factorization.

1264061551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867848.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1264061551 is about 35553.6432872920. The cubic root of 1264061551 is about 1081.2415850816.

The spelling of 1264061551 in words is "one billion, two hundred sixty-four million, sixty-one thousand, five hundred fifty-one".