31012142461 has 4 divisors (see below), whose sum is σ = 31124099932. Its totient is φ = 30900184992.

The previous prime is 31012142459. The next prime is 31012142501. The reversal of 31012142461 is 16424121013.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19991132100 + 11021010361 = 141390^2 + 104981^2 .

It is a cyclic number.

It is not a de Polignac number, because 31012142461 - 2¹ = 31012142459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012142401) 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, 55978320 + ... + 55978873.

It is an arithmetic number, because the mean of its divisors is an integer number (7781024983).

Almost surely, 2^31012142461 is an apocalyptic number.

It is an amenable number.

31012142461 is a deficient number, since it is larger than the sum of its proper divisors (111957471).

31012142461 is a wasteful number, since it uses less digits than its factorization.

31012142461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111957470.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 31012142461 its reverse (16424121013), we get a palindrome (47436263474).

The spelling of 31012142461 in words is "thirty-one billion, twelve million, one hundred forty-two thousand, four hundred sixty-one".