102639261 has 8 divisors (see below), whose sum is σ = 136900224. Its totient is φ = 68402240.

The previous prime is 102639259. The next prime is 102639263. The reversal of 102639261 is 162936201.

It is an interprime number because it is at equal distance from previous prime (102639259) and next prime (102639263).

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 102639261 - 2¹ = 102639259 is a prime.

It is a super-2 number, since 2×102639261² = 21069635797252242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102639263) 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, 10540 + ... + 17786.

It is an arithmetic number, because the mean of its divisors is an integer number (17112528).

Almost surely, 2^102639261 is an apocalyptic number.

It is an amenable number.

102639261 is a deficient number, since it is larger than the sum of its proper divisors (34260963).

102639261 is an equidigital number, since it uses as much as digits as its factorization.

102639261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11971.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 102639261 is about 10131.1036417559. The cubic root of 102639261 is about 468.2069314641.

The spelling of 102639261 in words is "one hundred two million, six hundred thirty-nine thousand, two hundred sixty-one".