102651391 has 2 divisors, whose sum is σ = 102651392. Its totient is φ = 102651390.

The previous prime is 102651379. The next prime is 102651397. The reversal of 102651391 is 193156201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102651391 - 2¹⁵ = 102618623 is a prime.

It is equal to p_5905423 and since 102651391 and 5905423 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102651397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51325695 + 51325696.

It is an arithmetic number, because the mean of its divisors is an integer number (51325696).

Almost surely, 2^102651391 is an apocalyptic number.

102651391 is a deficient number, since it is larger than the sum of its proper divisors (1).

102651391 is an equidigital number, since it uses as much as digits as its factorization.

102651391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 102651391 is about 10131.7022755310. The cubic root of 102651391 is about 468.2253751094.

The spelling of 102651391 in words is "one hundred two million, six hundred fifty-one thousand, three hundred ninety-one".