1225420777 has 4 divisors (see below), whose sum is σ = 1400480896. Its totient is φ = 1050360660.

The previous prime is 1225420771. The next prime is 1225420831. The reversal of 1225420777 is 7770245221.

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: 7770245221 = 101 ⋅76933121.

It is a cyclic number.

It is not a de Polignac number, because 1225420777 - 2³ = 1225420769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225420771) 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, 87530049 + ... + 87530062.

It is an arithmetic number, because the mean of its divisors is an integer number (350120224).

Almost surely, 2^1225420777 is an apocalyptic number.

It is an amenable number.

1225420777 is a deficient number, since it is larger than the sum of its proper divisors (175060119).

1225420777 is an equidigital number, since it uses as much as digits as its factorization.

1225420777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175060118.

The product of its (nonzero) digits is 54880, while the sum is 37.

The square root of 1225420777 is about 35006.0105838983. The cubic root of 1225420777 is about 1070.1099770501.

Adding to 1225420777 its reverse (7770245221), we get a palindrome (8995665998).

The spelling of 1225420777 in words is "one billion, two hundred twenty-five million, four hundred twenty thousand, seven hundred seventy-seven".