1225022639 has 4 divisors (see below), whose sum is σ = 1228307256. Its totient is φ = 1221738024.

The previous prime is 1225022609. The next prime is 1225022651. The reversal of 1225022639 is 9362205221.

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

It is a cyclic number.

It is not a de Polignac number, because 1225022639 - 2²⁸ = 956587183 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 (1225022609) 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, 1641749 + ... + 1642494.

It is an arithmetic number, because the mean of its divisors is an integer number (307076814).

Almost surely, 2^1225022639 is an apocalyptic number.

1225022639 is a deficient number, since it is larger than the sum of its proper divisors (3284617).

1225022639 is an equidigital number, since it uses as much as digits as its factorization.

1225022639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3284616.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1225022639 is about 35000.3234127915. The cubic root of 1225022639 is about 1069.9940719385.

The spelling of 1225022639 in words is "one billion, two hundred twenty-five million, twenty-two thousand, six hundred thirty-nine".