100531397 has 2 divisors, whose sum is σ = 100531398. Its totient is φ = 100531396.

The previous prime is 100531393. The next prime is 100531427. The reversal of 100531397 is 793135001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86136961 + 14394436 = 9281^2 + 3794^2 .

It is a cyclic number.

It is not a de Polignac number, because 100531397 - 2² = 100531393 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100531393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50265698 + 50265699.

It is an arithmetic number, because the mean of its divisors is an integer number (50265699).

Almost surely, 2^100531397 is an apocalyptic number.

It is an amenable number.

100531397 is a deficient number, since it is larger than the sum of its proper divisors (1).

100531397 is an equidigital number, since it uses as much as digits as its factorization.

100531397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2835, while the sum is 29.

The square root of 100531397 is about 10026.5346456291. The cubic root of 100531397 is about 464.9796067674.

Adding to 100531397 its reverse (793135001), we get a palindrome (893666398).

It can be divided in two parts, 10053 and 1397, that multiplied together give a palindrome (14044041).

The spelling of 100531397 in words is "one hundred million, five hundred thirty-one thousand, three hundred ninety-seven".