1247552213 has 4 divisors (see below), whose sum is σ = 1271090988. Its totient is φ = 1224013440.

The previous prime is 1247552209. The next prime is 1247552221. The reversal of 1247552213 is 3122557421.

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 622652209 + 624900004 = 24953^2 + 24998^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247552213 - 2² = 1247552209 is a prime.

It is a super-2 number, since 2×1247552213² = 3112773048322394738, which contains 22 as substring.

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 1247552213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247552203) 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, 11769308 + ... + 11769413.

It is an arithmetic number, because the mean of its divisors is an integer number (317772747).

Almost surely, 2^1247552213 is an apocalyptic number.

It is an amenable number.

1247552213 is a deficient number, since it is larger than the sum of its proper divisors (23538775).

1247552213 is an equidigital number, since it uses as much as digits as its factorization.

1247552213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23538774.

The product of its digits is 16800, while the sum is 32.

The square root of 1247552213 is about 35320.7051600049. The cubic root of 1247552213 is about 1076.5137392451.

The spelling of 1247552213 in words is "one billion, two hundred forty-seven million, five hundred fifty-two thousand, two hundred thirteen".