620171138 has 4 divisors (see below), whose sum is σ = 930256710. Its totient is φ = 310085568.

The previous prime is 620171113. The next prime is 620171143. The reversal of 620171138 is 831171026.

620171138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 527299369 + 92871769 = 22963^2 + 9637^2 .

It is a super-2 number, since 2×620171138² = 769224480816430088, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 620171138.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155042783 + ... + 155042786.

Almost surely, 2^620171138 is an apocalyptic number.

620171138 is a deficient number, since it is larger than the sum of its proper divisors (310085572).

620171138 is a wasteful number, since it uses less digits than its factorization.

620171138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310085571.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 620171138 is about 24903.2354926022. The cubic root of 620171138 is about 852.7803479371.

The spelling of 620171138 in words is "six hundred twenty million, one hundred seventy-one thousand, one hundred thirty-eight".