1261473213 has 64 divisors (see below), whose sum is σ = 2377267200. Its totient is φ = 573039360.

The previous prime is 1261473167. The next prime is 1261473221. The reversal of 1261473213 is 3123741621.

It is a happy number.

It is not a de Polignac number, because 1261473213 - 2⁹ = 1261472701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261473223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 46003 + ... + 68111.

It is an arithmetic number, because the mean of its divisors is an integer number (37144800).

Almost surely, 2^1261473213 is an apocalyptic number.

1261473213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1261473213 is a deficient number, since it is larger than the sum of its proper divisors (1115793987).

1261473213 is a wasteful number, since it uses less digits than its factorization.

1261473213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22162.

The product of its digits is 6048, while the sum is 30.

The square root of 1261473213 is about 35517.2241736316. The cubic root of 1261473213 is about 1080.5030843760.

It can be divided in two parts, 1261 and 473213, that added together give a palindrome (474474).

The spelling of 1261473213 in words is "one billion, two hundred sixty-one million, four hundred seventy-three thousand, two hundred thirteen".