1261224613 has 4 divisors (see below), whose sum is σ = 1375881408. Its totient is φ = 1146567820.

The previous prime is 1261224589. The next prime is 1261224637. The reversal of 1261224613 is 3164221621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1261224589) and next prime (1261224637).

It is a cyclic number.

It is not a de Polignac number, because 1261224613 - 2¹³ = 1261216421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261221613) 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, 57328381 + ... + 57328402.

It is an arithmetic number, because the mean of its divisors is an integer number (343970352).

Almost surely, 2^1261224613 is an apocalyptic number.

It is an amenable number.

1261224613 is a deficient number, since it is larger than the sum of its proper divisors (114656795).

1261224613 is a wasteful number, since it uses less digits than its factorization.

1261224613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114656794.

The product of its digits is 3456, while the sum is 28.

The square root of 1261224613 is about 35513.7242907584. The cubic root of 1261224613 is about 1080.4321010444.

The spelling of 1261224613 in words is "one billion, two hundred sixty-one million, two hundred twenty-four thousand, six hundred thirteen".