61020931 has 2 divisors, whose sum is σ = 61020932. Its totient is φ = 61020930.

The previous prime is 61020929. The next prime is 61020937. The reversal of 61020931 is 13902016.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61020931 - 2¹ = 61020929 is a prime.

It is a super-2 number, since 2×61020931² = 7447108040213522, which contains 22 as substring.

Together with 61020929, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (61020937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30510465 + 30510466.

It is an arithmetic number, because the mean of its divisors is an integer number (30510466).

Almost surely, 2^61020931 is an apocalyptic number.

61020931 is a deficient number, since it is larger than the sum of its proper divisors (1).

61020931 is an equidigital number, since it uses as much as digits as its factorization.

61020931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 61020931 is about 7811.5895309470. The cubic root of 61020931 is about 393.6947376546.

Adding to 61020931 its reverse (13902016), we get a palindrome (74922947).

The spelling of 61020931 in words is "sixty-one million, twenty thousand, nine hundred thirty-one".