102831121 has 4 divisors (see below), whose sum is σ = 103054644. Its totient is φ = 102607600.

The previous prime is 102831119. The next prime is 102831133. The reversal of 102831121 is 121138201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36180225 + 66650896 = 6015^2 + 8164^2 .

It is a cyclic number.

It is not a de Polignac number, because 102831121 - 2¹ = 102831119 is a prime.

It is a super-2 number, since 2×102831121² = 21148478892233282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102831101) 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, 111070 + ... + 111991.

It is an arithmetic number, because the mean of its divisors is an integer number (25763661).

Almost surely, 2^102831121 is an apocalyptic number.

It is an amenable number.

102831121 is a deficient number, since it is larger than the sum of its proper divisors (223523).

102831121 is an equidigital number, since it uses as much as digits as its factorization.

102831121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223522.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 102831121 is about 10140.5680807339. The cubic root of 102831121 is about 468.4984841861.

Adding to 102831121 its reverse (121138201), we get a palindrome (223969322).

The spelling of 102831121 in words is "one hundred two million, eight hundred thirty-one thousand, one hundred twenty-one".