100155521 has 2 divisors, whose sum is σ = 100155522. Its totient is φ = 100155520.

The previous prime is 100155493. The next prime is 100155533. The reversal of 100155521 is 125551001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99281296 + 874225 = 9964^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 100155521 - 2⁶ = 100155457 is a prime.

It is a super-2 number, since 2×100155521² = 20062256773562882, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 100155493 and 100155502.

It is not a weakly prime, because it can be changed into another prime (100155571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50077760 + 50077761.

It is an arithmetic number, because the mean of its divisors is an integer number (50077761).

Almost surely, 2^100155521 is an apocalyptic number.

It is an amenable number.

100155521 is a deficient number, since it is larger than the sum of its proper divisors (1).

100155521 is an equidigital number, since it uses as much as digits as its factorization.

100155521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 100155521 is about 10007.7730290010. The cubic root of 100155521 is about 464.3993802423.

The spelling of 100155521 in words is "one hundred million, one hundred fifty-five thousand, five hundred twenty-one".