31505442025 has 12 divisors (see below), whose sum is σ = 39071826252. Its totient is φ = 25201077440.

The previous prime is 31505442019. The next prime is 31505442029. The reversal of 31505442025 is 52024450513.

It can be written as a sum of positive squares in 6 ways, for example, as 5498074201 + 26007367824 = 74149^2 + 161268^2 .

It is not a de Polignac number, because 31505442025 - 2¹⁷ = 31505310953 is a prime.

It is a super-3 number, since 3×31505442025³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31505442029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124467 + ... + 280183.

It is an arithmetic number, because the mean of its divisors is an integer number (3255985521).

Almost surely, 2^31505442025 is an apocalyptic number.

It is an amenable number.

31505442025 is a deficient number, since it is larger than the sum of its proper divisors (7566384227).

31505442025 is a wasteful number, since it uses less digits than its factorization.

31505442025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163820 (or 163815 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 31505442025 its reverse (52024450513), we get a palindrome (83529892538).

The spelling of 31505442025 in words is "thirty-one billion, five hundred five million, four hundred forty-two thousand, twenty-five".