102261391 has 2 divisors, whose sum is σ = 102261392. Its totient is φ = 102261390.

The previous prime is 102261349. The next prime is 102261407. The reversal of 102261391 is 193162201.

It is a strong prime.

It is an emirp because it is prime and its reverse (193162201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102261391 - 2¹³ = 102253199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102261311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51130695 + 51130696.

It is an arithmetic number, because the mean of its divisors is an integer number (51130696).

Almost surely, 2^102261391 is an apocalyptic number.

102261391 is a deficient number, since it is larger than the sum of its proper divisors (1).

102261391 is an equidigital number, since it uses as much as digits as its factorization.

102261391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 102261391 is about 10112.4374410920. The cubic root of 102261391 is about 467.6316515609.

The spelling of 102261391 in words is "one hundred two million, two hundred sixty-one thousand, three hundred ninety-one".