31212051042541 has 4 divisors (see below), whose sum is σ = 32218891398784. Its totient is φ = 30205210686300.

The previous prime is 31212051042533. The next prime is 31212051042547. The reversal of 31212051042541 is 14524015021213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31212051042541 - 2³ = 31212051042533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1006840356211 = 31212051042541 / (3 + 1 + 2 + 1 + 2 + 0 + 5 + 1 + 0 + 4 + 2 + 5 + 4 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212051042547) 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, 503420178075 + ... + 503420178136.

It is an arithmetic number, because the mean of its divisors is an integer number (8054722849696).

Almost surely, 2^{31212051042541} is an apocalyptic number.

31212051042541 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31212051042541 is a deficient number, since it is larger than the sum of its proper divisors (1006840356243).

31212051042541 is a wasteful number, since it uses less digits than its factorization.

31212051042541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006840356242.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 31212051042541 its reverse (14524015021213), we get a palindrome (45736066063754).

The spelling of 31212051042541 in words is "thirty-one trillion, two hundred twelve billion, fifty-one million, forty-two thousand, five hundred forty-one".