103131621 has 12 divisors (see below), whose sum is σ = 149125548. Its totient is φ = 68681664.

The previous prime is 103131619. The next prime is 103131649. The reversal of 103131621 is 126131301.

103131621 is a `hidden beast` number, since 10 + 3 + 1 + 31 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 93896100 + 9235521 = 9690^2 + 3039^2 .

It is not a de Polignac number, because 103131621 - 2¹ = 103131619 is a prime.

It is a super-2 number, since 2×103131621² = 21272262500175282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 103131594 and 103131603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103121621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3751 + ... + 14843.

It is an arithmetic number, because the mean of its divisors is an integer number (12427129).

Almost surely, 2^103131621 is an apocalyptic number.

It is an amenable number.

103131621 is a deficient number, since it is larger than the sum of its proper divisors (45993927).

103131621 is a wasteful number, since it uses less digits than its factorization.

103131621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12132 (or 12129 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 103131621 is about 10155.3739960673. The cubic root of 103131621 is about 468.9543996048.

Adding to 103131621 its reverse (126131301), we get a palindrome (229262922).

The spelling of 103131621 in words is "one hundred three million, one hundred thirty-one thousand, six hundred twenty-one".