1225604531 has 2 divisors, whose sum is σ = 1225604532. Its totient is φ = 1225604530.

The previous prime is 1225604503. The next prime is 1225604537. The reversal of 1225604531 is 1354065221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225604531 is a prime.

It is a super-2 number, since 2×1225604531² = 3004212932815459922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1225604494 and 1225604503.

It is not a weakly prime, because it can be changed into another prime (1225604537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612802265 + 612802266.

It is an arithmetic number, because the mean of its divisors is an integer number (612802266).

Almost surely, 2^1225604531 is an apocalyptic number.

1225604531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225604531 is an equidigital number, since it uses as much as digits as its factorization.

1225604531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1225604531 is about 35008.6350919312. The cubic root of 1225604531 is about 1070.1634626676.

Adding to 1225604531 its reverse (1354065221), we get a palindrome (2579669752).

The spelling of 1225604531 in words is "one billion, two hundred twenty-five million, six hundred four thousand, five hundred thirty-one".