61287731 has 2 divisors, whose sum is σ = 61287732. Its totient is φ = 61287730.

The previous prime is 61287727. The next prime is 61287739. The reversal of 61287731 is 13778216.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61287731 - 2² = 61287727 is a prime.

It is a super-2 number, since 2×61287731² = 7512371942256722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61287691 and 61287700.

It is not a weakly prime, because it can be changed into another prime (61287739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30643865 + 30643866.

It is an arithmetic number, because the mean of its divisors is an integer number (30643866).

Almost surely, 2^61287731 is an apocalyptic number.

61287731 is a deficient number, since it is larger than the sum of its proper divisors (1).

61287731 is an equidigital number, since it uses as much as digits as its factorization.

61287731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 35.

The square root of 61287731 is about 7828.6480952972. The cubic root of 61287731 is about 394.2676833667.

The spelling of 61287731 in words is "sixty-one million, two hundred eighty-seven thousand, seven hundred thirty-one".