61529231 has 2 divisors, whose sum is σ = 61529232. Its totient is φ = 61529230.

The previous prime is 61529191. The next prime is 61529257. The reversal of 61529231 is 13292516.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61529231 is a prime.

It is a super-2 number, since 2×61529231² = 7571692534902722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61529194 and 61529203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61520231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30764615 + 30764616.

It is an arithmetic number, because the mean of its divisors is an integer number (30764616).

Almost surely, 2^61529231 is an apocalyptic number.

61529231 is a deficient number, since it is larger than the sum of its proper divisors (1).

61529231 is an equidigital number, since it uses as much as digits as its factorization.

61529231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 61529231 is about 7844.0570497670. The cubic root of 61529231 is about 394.7848660258.

The spelling of 61529231 in words is "sixty-one million, five hundred twenty-nine thousand, two hundred thirty-one".