109521457 has 4 divisors (see below), whose sum is σ = 109547620. Its totient is φ = 109495296.

The previous prime is 109521397. The next prime is 109521509. The reversal of 109521457 is 754125901.

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 87534736 + 21986721 = 9356^2 + 4689^2 .

It is a 3-Lehmer number, since φ(109521457) divides (109521457-1)³.

It is a cyclic number.

It is not a de Polignac number, because 109521457 - 2¹⁵ = 109488689 is a prime.

It is a deceptive number, since it divides R_109521456.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109521257) 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, 5232 + ... + 15697.

It is an arithmetic number, because the mean of its divisors is an integer number (27386905).

Almost surely, 2^109521457 is an apocalyptic number.

109521457 is the 5233-rd decagonal number.

It is an amenable number.

109521457 is a deficient number, since it is larger than the sum of its proper divisors (26163).

109521457 is an equidigital number, since it uses as much as digits as its factorization.

109521457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26162.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 109521457 is about 10465.2499731253. The cubic root of 109521457 is about 478.4461573740.

The spelling of 109521457 in words is "one hundred nine million, five hundred twenty-one thousand, four hundred fifty-seven".