102257391 has 8 divisors (see below), whose sum is σ = 136851120. Its totient is φ = 67917632.

The previous prime is 102257377. The next prime is 102257401. The reversal of 102257391 is 193752201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102257391 - 2⁶ = 102257327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102257291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62550 + ... + 64163.

It is an arithmetic number, because the mean of its divisors is an integer number (17106390).

Almost surely, 2^102257391 is an apocalyptic number.

102257391 is a deficient number, since it is larger than the sum of its proper divisors (34593729).

102257391 is a wasteful number, since it uses less digits than its factorization.

102257391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126985.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 102257391 is about 10112.2396629036. The cubic root of 102257391 is about 467.6255542744.

The spelling of 102257391 in words is "one hundred two million, two hundred fifty-seven thousand, three hundred ninety-one".