1225761249 has 4 divisors (see below), whose sum is σ = 1634348336. Its totient is φ = 817174164.

The previous prime is 1225761247. The next prime is 1225761259. The reversal of 1225761249 is 9421675221.

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 not a de Polignac number, because 1225761249 - 2¹ = 1225761247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225761247) 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, 204293539 + ... + 204293544.

It is an arithmetic number, because the mean of its divisors is an integer number (408587084).

Almost surely, 2^1225761249 is an apocalyptic number.

It is an amenable number.

1225761249 is a deficient number, since it is larger than the sum of its proper divisors (408587087).

1225761249 is an equidigital number, since it uses as much as digits as its factorization.

1225761249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408587086.

The product of its digits is 60480, while the sum is 39.

The square root of 1225761249 is about 35010.8732967345. The cubic root of 1225761249 is about 1070.2090746425.

The spelling of 1225761249 in words is "one billion, two hundred twenty-five million, seven hundred sixty-one thousand, two hundred forty-nine".