105521131531 has 2 divisors, whose sum is σ = 105521131532. Its totient is φ = 105521131530.

The previous prime is 105521131489. The next prime is 105521131553. The reversal of 105521131531 is 135131125501.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 105521131531 - 2⁷ = 105521131403 is a prime.

It is a super-2 number, since 2×105521131531² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 105521131531.

It is not a weakly prime, because it can be changed into another prime (105521131631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52760565765 + 52760565766.

It is an arithmetic number, because the mean of its divisors is an integer number (52760565766).

Almost surely, 2^105521131531 is an apocalyptic number.

105521131531 is a deficient number, since it is larger than the sum of its proper divisors (1).

105521131531 is an equidigital number, since it uses as much as digits as its factorization.

105521131531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2250, while the sum is 28.

The spelling of 105521131531 in words is "one hundred five billion, five hundred twenty-one million, one hundred thirty-one thousand, five hundred thirty-one".