1225531031 has 8 divisors (see below), whose sum is σ = 1253848464. Its totient is φ = 1197406080.

The previous prime is 1225531009. The next prime is 1225531061. The reversal of 1225531031 is 1301355221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225531031 is a prime.

It is a super-2 number, since 2×1225531031² = 3003852615887845922, 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 = 1225530988 and 1225531006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225531001) 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, 35201 + ... + 60746.

It is an arithmetic number, because the mean of its divisors is an integer number (156731058).

Almost surely, 2^1225531031 is an apocalyptic number.

1225531031 is a deficient number, since it is larger than the sum of its proper divisors (28317433).

1225531031 is an equidigital number, since it uses as much as digits as its factorization.

1225531031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96241.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1225531031 is about 35007.5853351813. The cubic root of 1225531031 is about 1070.1420695278.

Adding to 1225531031 its reverse (1301355221), we get a palindrome (2526886252).

The spelling of 1225531031 in words is "one billion, two hundred twenty-five million, five hundred thirty-one thousand, thirty-one".