1225021431 has 4 divisors (see below), whose sum is σ = 1633361912. Its totient is φ = 816680952.

The previous prime is 1225021403. The next prime is 1225021471. The reversal of 1225021431 is 1341205221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1341205221 = 3 ⋅447068407.

It is not a de Polignac number, because 1225021431 - 2¹⁵ = 1224988663 is a prime.

It is a super-2 number, since 2×1225021431² = 3001355012818575522, 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 = 1225021398 and 1225021407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225021471) 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, 204170236 + ... + 204170241.

It is an arithmetic number, because the mean of its divisors is an integer number (408340478).

Almost surely, 2^1225021431 is an apocalyptic number.

1225021431 is a deficient number, since it is larger than the sum of its proper divisors (408340481).

1225021431 is an equidigital number, since it uses as much as digits as its factorization.

1225021431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408340480.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1225021431 is about 35000.3061558038. The cubic root of 1225021431 is about 1069.9937202298.

Adding to 1225021431 its reverse (1341205221), we get a palindrome (2566226652).

The spelling of 1225021431 in words is "one billion, two hundred twenty-five million, twenty-one thousand, four hundred thirty-one".