626139091 has 8 divisors (see below), whose sum is σ = 661605120. Its totient is φ = 590924232.

The previous prime is 626139089. The next prime is 626139103. The reversal of 626139091 is 190931626.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 626139091 - 2¹ = 626139089 is a prime.

It is a super-2 number, since 2×626139091² = 784100322556612562, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 626139091.

It is not an unprimeable number, because it can be changed into a prime (626139001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57655 + ... + 67648.

It is an arithmetic number, because the mean of its divisors is an integer number (82700640).

Almost surely, 2^626139091 is an apocalyptic number.

626139091 is a deficient number, since it is larger than the sum of its proper divisors (35466029).

626139091 is a wasteful number, since it uses less digits than its factorization.

626139091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125585.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 626139091 is about 25022.7714492220. The cubic root of 626139091 is about 855.5070762926.

The spelling of 626139091 in words is "six hundred twenty-six million, one hundred thirty-nine thousand, ninety-one".