30690031 has 4 divisors (see below), whose sum is σ = 31680064. Its totient is φ = 29700000.

The previous prime is 30690029. The next prime is 30690041. The reversal of 30690031 is 13009603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13009603 = 29 ⋅448607.

It is a cyclic number.

It is not a de Polignac number, because 30690031 - 2¹ = 30690029 is a prime.

It is a super-2 number, since 2×30690031² = 1883756005561922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30689984 and 30690011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30690001) 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, 494970 + ... + 495031.

It is an arithmetic number, because the mean of its divisors is an integer number (7920016).

Almost surely, 2^30690031 is an apocalyptic number.

30690031 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

30690031 is the 2478-th centered decagonal number.

30690031 is a deficient number, since it is larger than the sum of its proper divisors (990033).

30690031 is an equidigital number, since it uses as much as digits as its factorization.

30690031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990032.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 30690031 is about 5539.8583916920. The cubic root of 30690031 is about 313.0875338272.

Adding to 30690031 its reverse (13009603), we get a palindrome (43699634).

The spelling of 30690031 in words is "thirty million, six hundred ninety thousand, thirty-one".