101530991 has 2 divisors, whose sum is σ = 101530992. Its totient is φ = 101530990.

The previous prime is 101530981. The next prime is 101530999. The reversal of 101530991 is 199035101.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101530991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101530999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50765495 + 50765496.

It is an arithmetic number, because the mean of its divisors is an integer number (50765496).

Almost surely, 2^101530991 is an apocalyptic number.

101530991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101530991 is an equidigital number, since it uses as much as digits as its factorization.

101530991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1215, while the sum is 29.

The square root of 101530991 is about 10076.2587799242. The cubic root of 101530991 is about 466.5156403013.

The spelling of 101530991 in words is "one hundred one million, five hundred thirty thousand, nine hundred ninety-one".