31523642453 has 4 divisors (see below), whose sum is σ = 33377974380. Its totient is φ = 29669310528.

The previous prime is 31523642429. The next prime is 31523642497. The reversal of 31523642453 is 35424632513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35424632513 = 103 ⋅343928471.

It can be written as a sum of positive squares in 2 ways, for example, as 23292253924 + 8231388529 = 152618^2 + 90727^2 .

It is a cyclic number.

It is not a de Polignac number, because 31523642453 - 2⁶ = 31523642389 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 (31523642413) 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, 927165938 + ... + 927165971.

It is an arithmetic number, because the mean of its divisors is an integer number (8344493595).

Almost surely, 2^31523642453 is an apocalyptic number.

It is an amenable number.

31523642453 is a deficient number, since it is larger than the sum of its proper divisors (1854331927).

31523642453 is a wasteful number, since it uses less digits than its factorization.

31523642453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854331926.

The product of its digits is 259200, while the sum is 38.

The spelling of 31523642453 in words is "thirty-one billion, five hundred twenty-three million, six hundred forty-two thousand, four hundred fifty-three".