1264515421 has 8 divisors (see below), whose sum is σ = 1384111064. Its totient is φ = 1148109120.

The previous prime is 1264515397. The next prime is 1264515433. The reversal of 1264515421 is 1245154621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24700900 + 1239814521 = 4970^2 + 35211^2 .

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 1264515421 - 2²³ = 1256126813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264515121) 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, 796506 + ... + 798091.

It is an arithmetic number, because the mean of its divisors is an integer number (173013883).

Almost surely, 2^1264515421 is an apocalyptic number.

It is an amenable number.

1264515421 is a deficient number, since it is larger than the sum of its proper divisors (119595643).

1264515421 is a wasteful number, since it uses less digits than its factorization.

1264515421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594671.

The product of its digits is 9600, while the sum is 31.

The square root of 1264515421 is about 35560.0256046027. The cubic root of 1264515421 is about 1081.3709786739.

The spelling of 1264515421 in words is "one billion, two hundred sixty-four million, five hundred fifteen thousand, four hundred twenty-one".