1225451890 has 16 divisors (see below), whose sum is σ = 2375491608. Its totient is φ = 452474496.

The previous prime is 1225451881. The next prime is 1225451893. The reversal of 1225451890 is 981545221.

It can be written as a sum of positive squares in 4 ways, for example, as 526748401 + 698703489 = 22951^2 + 26433^2 .

It is not an unprimeable number, because it can be changed into a prime (1225451893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4713147 + ... + 4713406.

Almost surely, 2^1225451890 is an apocalyptic number.

1225451890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1225451890 is a deficient number, since it is larger than the sum of its proper divisors (1150039718).

1225451890 is a wasteful number, since it uses less digits than its factorization.

1225451890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9426573.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 1225451890 is about 35006.4549761897. The cubic root of 1225451890 is about 1070.1190335447.

The spelling of 1225451890 in words is "one billion, two hundred twenty-five million, four hundred fifty-one thousand, eight hundred ninety".