31505772541 has 2 divisors, whose sum is σ = 31505772542. Its totient is φ = 31505772540.

The previous prime is 31505772503. The next prime is 31505772553. The reversal of 31505772541 is 14527750513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17418456441 + 14087316100 = 131979^2 + 118690^2 .

It is a cyclic number.

It is not a de Polignac number, because 31505772541 - 2¹⁷ = 31505641469 is a prime.

It is a super-2 number, since 2×31505772541² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31505772494 and 31505772503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31505772581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15752886270 + 15752886271.

It is an arithmetic number, because the mean of its divisors is an integer number (15752886271).

Almost surely, 2^31505772541 is an apocalyptic number.

It is an amenable number.

31505772541 is a deficient number, since it is larger than the sum of its proper divisors (1).

31505772541 is an equidigital number, since it uses as much as digits as its factorization.

31505772541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147000, while the sum is 40.

The spelling of 31505772541 in words is "thirty-one billion, five hundred five million, seven hundred seventy-two thousand, five hundred forty-one".