61810531 has 2 divisors, whose sum is σ = 61810532. Its totient is φ = 61810530.

The previous prime is 61810501. The next prime is 61810537. The reversal of 61810531 is 13501816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61810531 - 2¹⁷ = 61679459 is a prime.

It is a super-2 number, since 2×61810531² = 7641083485003922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61810496 and 61810505.

It is not a weakly prime, because it can be changed into another prime (61810537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30905265 + 30905266.

It is an arithmetic number, because the mean of its divisors is an integer number (30905266).

Almost surely, 2^61810531 is an apocalyptic number.

61810531 is a deficient number, since it is larger than the sum of its proper divisors (1).

61810531 is an equidigital number, since it uses as much as digits as its factorization.

61810531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 61810531 is about 7861.9673746461. The cubic root of 61810531 is about 395.3855787376.

The spelling of 61810531 in words is "sixty-one million, eight hundred ten thousand, five hundred thirty-one".