61009231 has 2 divisors, whose sum is σ = 61009232. Its totient is φ = 61009230.

The previous prime is 61009199. The next prime is 61009241. The reversal of 61009231 is 13290016.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61009231 - 2⁵ = 61009199 is a prime.

It is a super-2 number, since 2×61009231² = 7444252534422722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61009241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30504615 + 30504616.

It is an arithmetic number, because the mean of its divisors is an integer number (30504616).

Almost surely, 2^61009231 is an apocalyptic number.

61009231 is a deficient number, since it is larger than the sum of its proper divisors (1).

61009231 is an equidigital number, since it uses as much as digits as its factorization.

61009231 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 61009231 is about 7810.8406077707. The cubic root of 61009231 is about 393.6695740330.

Adding to 61009231 its reverse (13290016), we get a palindrome (74299247).

The spelling of 61009231 in words is "sixty-one million, nine thousand, two hundred thirty-one".