106721497 has 4 divisors (see below), whose sum is σ = 107038516. Its totient is φ = 106404480.

The previous prime is 106721471. The next prime is 106721519. The reversal of 106721497 is 794127601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35808256 + 70913241 = 5984^2 + 8421^2 .

It is a cyclic number.

It is not a de Polignac number, because 106721497 - 2⁷ = 106721369 is a prime.

It is a super-2 number, since 2×106721497² = 22778955843842018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106721467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158004 + ... + 158677.

It is an arithmetic number, because the mean of its divisors is an integer number (26759629).

Almost surely, 2^106721497 is an apocalyptic number.

It is an amenable number.

106721497 is a deficient number, since it is larger than the sum of its proper divisors (317019).

106721497 is an equidigital number, since it uses as much as digits as its factorization.

106721497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317018.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 106721497 is about 10330.6097109512. The cubic root of 106721497 is about 474.3336873647. Note that the first 3 decimals are identical.

The spelling of 106721497 in words is "one hundred six million, seven hundred twenty-one thousand, four hundred ninety-seven".