101521531 has 2 divisors, whose sum is σ = 101521532. Its totient is φ = 101521530.

The previous prime is 101521487. The next prime is 101521543. The reversal of 101521531 is 135125101.

It is a strong prime.

It is an emirp because it is prime and its reverse (135125101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101521531 - 2⁷ = 101521403 is a prime.

It is a super-2 number, since 2×101521531² = 20613242513167922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 101521499 and 101521508.

It is not a weakly prime, because it can be changed into another prime (101521561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50760765 + 50760766.

It is an arithmetic number, because the mean of its divisors is an integer number (50760766).

Almost surely, 2^101521531 is an apocalyptic number.

101521531 is a deficient number, since it is larger than the sum of its proper divisors (1).

101521531 is an equidigital number, since it uses as much as digits as its factorization.

101521531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 101521531 is about 10075.7893487309. The cubic root of 101521531 is about 466.5011508829.

Adding to 101521531 its reverse (135125101), we get a palindrome (236646632).

The spelling of 101521531 in words is "one hundred one million, five hundred twenty-one thousand, five hundred thirty-one".