102261557 has 2 divisors, whose sum is σ = 102261558. Its totient is φ = 102261556.

The previous prime is 102261521. The next prime is 102261583. The reversal of 102261557 is 755162201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102131236 + 130321 = 10106^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 102261557 - 2¹⁸ = 101999413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102261587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51130778 + 51130779.

It is an arithmetic number, because the mean of its divisors is an integer number (51130779).

Almost surely, 2^102261557 is an apocalyptic number.

It is an amenable number.

102261557 is a deficient number, since it is larger than the sum of its proper divisors (1).

102261557 is an equidigital number, since it uses as much as digits as its factorization.

102261557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 102261557 is about 10112.4456488033. The cubic root of 102261557 is about 467.6319045949.

The spelling of 102261557 in words is "one hundred two million, two hundred sixty-one thousand, five hundred fifty-seven".