181428902 has 4 divisors (see below), whose sum is σ = 272143356. Its totient is φ = 90714450.

The previous prime is 181428887. The next prime is 181428917. The reversal of 181428902 is 209824181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 209824181 = 7 ⋅29974883.

It is an interprime number because it is at equal distance from previous prime (181428887) and next prime (181428917).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45357224 + ... + 45357227.

It is an arithmetic number, because the mean of its divisors is an integer number (68035839).

Almost surely, 2^181428902 is an apocalyptic number.

181428902 is a deficient number, since it is larger than the sum of its proper divisors (90714454).

181428902 is an equidigital number, since it uses as much as digits as its factorization.

181428902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90714453.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 181428902 is about 13469.5546325779. The cubic root of 181428902 is about 566.1117348612. Note that the first 3 decimals are identical.

The spelling of 181428902 in words is "one hundred eighty-one million, four hundred twenty-eight thousand, nine hundred two".