1225255531 has 4 divisors (see below), whose sum is σ = 1225390464. Its totient is φ = 1225120600.

The previous prime is 1225255529. The next prime is 1225255541. The reversal of 1225255531 is 1355525221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1225255531 - 2¹ = 1225255529 is a prime.

It is a super-2 number, since 2×1225255531² = 3002502232492183922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225255493 and 1225255502.

It is not an unprimeable number, because it can be changed into a prime (1225255511) 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, 52780 + ... + 72361.

It is an arithmetic number, because the mean of its divisors is an integer number (306347616).

Almost surely, 2^1225255531 is an apocalyptic number.

1225255531 is a deficient number, since it is larger than the sum of its proper divisors (134933).

1225255531 is an equidigital number, since it uses as much as digits as its factorization.

1225255531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134932.

The product of its digits is 15000, while the sum is 31.

The square root of 1225255531 is about 35003.6502525094. The cubic root of 1225255531 is about 1070.0618740241.

The spelling of 1225255531 in words is "one billion, two hundred twenty-five million, two hundred fifty-five thousand, five hundred thirty-one".