102545257 has 4 divisors (see below), whose sum is σ = 102705876. Its totient is φ = 102384640.

The previous prime is 102545249. The next prime is 102545263. The reversal of 102545257 is 752545201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752545201 = 41 ⋅18354761.

It can be written as a sum of positive squares in 2 ways, for example, as 39992976 + 62552281 = 6324^2 + 7909^2 .

It is a cyclic number.

It is not a de Polignac number, because 102545257 - 2³ = 102545249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102545057) 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, 79348 + ... + 80629.

It is an arithmetic number, because the mean of its divisors is an integer number (25676469).

Almost surely, 2^102545257 is an apocalyptic number.

It is an amenable number.

102545257 is a deficient number, since it is larger than the sum of its proper divisors (160619).

102545257 is an equidigital number, since it uses as much as digits as its factorization.

102545257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160618.

The product of its (nonzero) digits is 14000, while the sum is 31.

The square root of 102545257 is about 10126.4632029154. The cubic root of 102545257 is about 468.0639492446.

The spelling of 102545257 in words is "one hundred two million, five hundred forty-five thousand, two hundred fifty-seven".