61543631 has 2 divisors, whose sum is σ = 61543632. Its totient is φ = 61543630.

The previous prime is 61543613. The next prime is 61543637. The reversal of 61543631 is 13634516.

It is a happy number.

Together with previous prime (61543613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61543631 - 2⁶ = 61543567 is a prime.

It is a super-2 number, since 2×61543631² = 7575237033328322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61543594 and 61543603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61543637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30771815 + 30771816.

It is an arithmetic number, because the mean of its divisors is an integer number (30771816).

Almost surely, 2^61543631 is an apocalyptic number.

61543631 is a deficient number, since it is larger than the sum of its proper divisors (1).

61543631 is an equidigital number, since it uses as much as digits as its factorization.

61543631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 61543631 is about 7844.9748884238. The cubic root of 61543631 is about 394.8156614627.

The spelling of 61543631 in words is "sixty-one million, five hundred forty-three thousand, six hundred thirty-one".