102651521 has 6 divisors (see below), whose sum is σ = 119411010. Its totient is φ = 87986976.

The previous prime is 102651487. The next prime is 102651529. The reversal of 102651521 is 125156201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 92640625 + 10010896 = 9625^2 + 3164^2 .

It is not a de Polignac number, because 102651521 - 2¹⁰ = 102650497 is a prime.

It is a super-2 number, since 2×102651521² = 21074669527226882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102651529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1047416 + ... + 1047513.

It is an arithmetic number, because the mean of its divisors is an integer number (19901835).

Almost surely, 2^102651521 is an apocalyptic number.

It is an amenable number.

102651521 is a deficient number, since it is larger than the sum of its proper divisors (16759489).

102651521 is an equidigital number, since it uses as much as digits as its factorization.

102651521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094943 (or 2094936 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 102651521 is about 10131.7086910353. The cubic root of 102651521 is about 468.2255727663.

The spelling of 102651521 in words is "one hundred two million, six hundred fifty-one thousand, five hundred twenty-one".