101512531 has 2 divisors, whose sum is σ = 101512532. Its totient is φ = 101512530.

The previous prime is 101512529. The next prime is 101512549. The reversal of 101512531 is 135215101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101512531 - 2¹ = 101512529 is a prime.

It is a super-2 number, since 2×101512531² = 20609587900051922, which contains 22 as substring.

Together with 101512529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 101512499 and 101512508.

It is not a weakly prime, because it can be changed into another prime (101512591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50756265 + 50756266.

It is an arithmetic number, because the mean of its divisors is an integer number (50756266).

Almost surely, 2^101512531 is an apocalyptic number.

101512531 is a deficient number, since it is larger than the sum of its proper divisors (1).

101512531 is an equidigital number, since it uses as much as digits as its factorization.

101512531 is an evil number, because the sum of its binary digits is even.

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

The square root of 101512531 is about 10075.3427236993. The cubic root of 101512531 is about 466.4873651884.

Adding to 101512531 its reverse (135215101), we get a palindrome (236727632).

The spelling of 101512531 in words is "one hundred one million, five hundred twelve thousand, five hundred thirty-one".