1513263421 has 4 divisors (see below), whose sum is σ = 1515422844. Its totient is φ = 1511104000.

The previous prime is 1513263391. The next prime is 1513263431. The reversal of 1513263421 is 1243623151.

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

It can be written as a sum of positive squares in 2 ways, for example, as 830016100 + 683247321 = 28810^2 + 26139^2 .

It is a cyclic number.

It is not a de Polignac number, because 1513263421 - 2²⁷ = 1379045693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1513263421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1513263431) 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, 1078660 + ... + 1080061.

It is an arithmetic number, because the mean of its divisors is an integer number (378855711).

Almost surely, 2^1513263421 is an apocalyptic number.

It is an amenable number.

1513263421 is a deficient number, since it is larger than the sum of its proper divisors (2159423).

1513263421 is an equidigital number, since it uses as much as digits as its factorization.

1513263421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159422.

The product of its digits is 4320, while the sum is 28.

The square root of 1513263421 is about 38900.6866391841. The cubic root of 1513263421 is about 1148.0783081520.

Adding to 1513263421 its reverse (1243623151), we get a palindrome (2756886572).

The spelling of 1513263421 in words is "one billion, five hundred thirteen million, two hundred sixty-three thousand, four hundred twenty-one".