102115402 has 4 divisors (see below), whose sum is σ = 153173106. Its totient is φ = 51057700.

The previous prime is 102115397. The next prime is 102115427. The reversal of 102115402 is 204511201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204511201 = 13151 ⋅15551.

It can be written as a sum of positive squares in only one way, i.e., 83375161 + 18740241 = 9131^2 + 4329^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25528849 + ... + 25528852.

Almost surely, 2^102115402 is an apocalyptic number.

102115402 is a deficient number, since it is larger than the sum of its proper divisors (51057704).

102115402 is an equidigital number, since it uses as much as digits as its factorization.

102115402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51057703.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 102115402 is about 10105.2165736317. The cubic root of 102115402 is about 467.4090142931.

Adding to 102115402 its reverse (204511201), we get a palindrome (306626603).

The spelling of 102115402 in words is "one hundred two million, one hundred fifteen thousand, four hundred two".