102140551 has 4 divisors (see below), whose sum is σ = 102311104. Its totient is φ = 101970000.

The previous prime is 102140513. The next prime is 102140603. The reversal of 102140551 is 155041201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155041201 = 7 ⋅22148743.

It is a cyclic number.

It is not a de Polignac number, because 102140551 - 2¹⁵ = 102107783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102140501) 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, 84375 + ... + 85576.

It is an arithmetic number, because the mean of its divisors is an integer number (25577776).

Almost surely, 2^102140551 is an apocalyptic number.

102140551 is a deficient number, since it is larger than the sum of its proper divisors (170553).

102140551 is an equidigital number, since it uses as much as digits as its factorization.

102140551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170552.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 102140551 is about 10106.4608543248. The cubic root of 102140551 is about 467.4473823362.

Adding to 102140551 its reverse (155041201), we get a palindrome (257181752).

The spelling of 102140551 in words is "one hundred two million, one hundred forty thousand, five hundred fifty-one".