102257047 has 4 divisors (see below), whose sum is σ = 103551520. Its totient is φ = 100962576.

The previous prime is 102257039. The next prime is 102257081. The reversal of 102257047 is 740752201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 102257047 - 2³ = 102257039 is a prime.

It is a super-2 number, since 2×102257047² = 20913007322320418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102257027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647118 + ... + 647275.

It is an arithmetic number, because the mean of its divisors is an integer number (25887880).

Almost surely, 2^102257047 is an apocalyptic number.

102257047 is a deficient number, since it is larger than the sum of its proper divisors (1294473).

102257047 is an equidigital number, since it uses as much as digits as its factorization.

102257047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294472.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 102257047 is about 10112.2226537987. Note that the first 3 decimals coincide. The cubic root of 102257047 is about 467.6250299004.

The spelling of 102257047 in words is "one hundred two million, two hundred fifty-seven thousand, forty-seven".