102540434 has 4 divisors (see below), whose sum is σ = 153810654. Its totient is φ = 51270216.

The previous prime is 102540421. The next prime is 102540443. The reversal of 102540434 is 434045201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434045201 = 719 ⋅603679.

It can be written as a sum of positive squares in only one way, i.e., 99062209 + 3478225 = 9953^2 + 1865^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25635107 + ... + 25635110.

Almost surely, 2^102540434 is an apocalyptic number.

102540434 is a deficient number, since it is larger than the sum of its proper divisors (51270220).

102540434 is an equidigital number, since it uses as much as digits as its factorization.

102540434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51270219.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 102540434 is about 10126.2250616901. The cubic root of 102540434 is about 468.0566109959.

Adding to 102540434 its reverse (434045201), we get a palindrome (536585635).

The spelling of 102540434 in words is "one hundred two million, five hundred forty thousand, four hundred thirty-four".