61020731 has 2 divisors, whose sum is σ = 61020732. Its totient is φ = 61020730.

The previous prime is 61020697. The next prime is 61020779. The reversal of 61020731 is 13702016.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61020731 - 2¹⁸ = 60758587 is a prime.

It is a super-2 number, since 2×61020731² = 7447059223548722, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (61020781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30510365 + 30510366.

It is an arithmetic number, because the mean of its divisors is an integer number (30510366).

Almost surely, 2^61020731 is an apocalyptic number.

61020731 is a deficient number, since it is larger than the sum of its proper divisors (1).

61020731 is an equidigital number, since it uses as much as digits as its factorization.

61020731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 61020731 is about 7811.5767294446. The cubic root of 61020731 is about 393.6943075343.

Adding to 61020731 its reverse (13702016), we get a palindrome (74722747).

The spelling of 61020731 in words is "sixty-one million, twenty thousand, seven hundred thirty-one".