61812031 has 2 divisors, whose sum is σ = 61812032. Its totient is φ = 61812030.

The previous prime is 61812029. The next prime is 61812041. The reversal of 61812031 is 13021816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61812031 - 2¹ = 61812029 is a prime.

It is a super-2 number, since 2×61812031² = 7641454352689922, which contains 22 as substring.

Together with 61812029, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61811993 and 61812011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61812041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30906015 + 30906016.

It is an arithmetic number, because the mean of its divisors is an integer number (30906016).

Almost surely, 2^61812031 is an apocalyptic number.

61812031 is a deficient number, since it is larger than the sum of its proper divisors (1).

61812031 is an equidigital number, since it uses as much as digits as its factorization.

61812031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 61812031 is about 7862.0627700369. The cubic root of 61812031 is about 395.3887770791.

Adding to 61812031 its reverse (13021816), we get a palindrome (74833847).

The spelling of 61812031 in words is "sixty-one million, eight hundred twelve thousand, thirty-one".