621138086 has 4 divisors (see below), whose sum is σ = 931707132. Its totient is φ = 310569042.

The previous prime is 621138073. The next prime is 621138107. The reversal of 621138086 is 680831126.

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

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, 155284520 + ... + 155284523.

It is an arithmetic number, because the mean of its divisors is an integer number (232926783).

Almost surely, 2^621138086 is an apocalyptic number.

621138086 is a deficient number, since it is larger than the sum of its proper divisors (310569046).

621138086 is a wasteful number, since it uses less digits than its factorization.

621138086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310569045.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 621138086 is about 24922.6420349047. The cubic root of 621138086 is about 853.2233256966.

The spelling of 621138086 in words is "six hundred twenty-one million, one hundred thirty-eight thousand, eighty-six".