1225352861 has 4 divisors (see below), whose sum is σ = 1242611424. Its totient is φ = 1208094300.

The previous prime is 1225352837. The next prime is 1225352923. The reversal of 1225352861 is 1682535221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1682535221 = 887 ⋅1896883.

It is a cyclic number.

It is not a de Polignac number, because 1225352861 - 2¹⁰ = 1225351837 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 (1225352831) 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, 8629175 + ... + 8629316.

It is an arithmetic number, because the mean of its divisors is an integer number (310652856).

Almost surely, 2^1225352861 is an apocalyptic number.

It is an amenable number.

1225352861 is a deficient number, since it is larger than the sum of its proper divisors (17258563).

1225352861 is an equidigital number, since it uses as much as digits as its factorization.

1225352861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17258562.

The product of its digits is 28800, while the sum is 35.

The square root of 1225352861 is about 35005.0405084753. The cubic root of 1225352861 is about 1070.0902072607.

The spelling of 1225352861 in words is "one billion, two hundred twenty-five million, three hundred fifty-two thousand, eight hundred sixty-one".