1225507251 has 16 divisors (see below), whose sum is σ = 1659881088. Its totient is φ = 804091200.

The previous prime is 1225507223. The next prime is 1225507301. The reversal of 1225507251 is 1527055221.

It is not a de Polignac number, because 1225507251 - 2¹³ = 1225499059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225507051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313831 + ... + 317711.

It is an arithmetic number, because the mean of its divisors is an integer number (103742568).

Almost surely, 2^1225507251 is an apocalyptic number.

1225507251 is a deficient number, since it is larger than the sum of its proper divisors (434373837).

1225507251 is a wasteful number, since it uses less digits than its factorization.

1225507251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5522.

The product of its (nonzero) digits is 7000, while the sum is 30.

The square root of 1225507251 is about 35007.2456928562. The cubic root of 1225507251 is about 1070.1351478636.

The spelling of 1225507251 in words is "one billion, two hundred twenty-five million, five hundred seven thousand, two hundred fifty-one".