102142541 has 4 divisors (see below), whose sum is σ = 103290300. Its totient is φ = 100994784.

The previous prime is 102142531. The next prime is 102142543. The reversal of 102142541 is 145241201.

It is a happy number.

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 48706441 + 53436100 = 6979^2 + 7310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102142541 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 (102142543) 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, 573746 + ... + 573923.

It is an arithmetic number, because the mean of its divisors is an integer number (25822575).

Almost surely, 2^102142541 is an apocalyptic number.

It is an amenable number.

102142541 is a deficient number, since it is larger than the sum of its proper divisors (1147759).

102142541 is an equidigital number, since it uses as much as digits as its factorization.

102142541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147758.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 102142541 is about 10106.5593057182. The cubic root of 102142541 is about 467.4504180690.

Adding to 102142541 its reverse (145241201), we get a palindrome (247383742).

The spelling of 102142541 in words is "one hundred two million, one hundred forty-two thousand, five hundred forty-one".