61531607 has 2 divisors, whose sum is σ = 61531608. Its totient is φ = 61531606.

The previous prime is 61531583. The next prime is 61531637. The reversal of 61531607 is 70613516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61531607 - 2⁶ = 61531543 is a prime.

It is a super-2 number, since 2×61531607² = 7572277320004898, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61531607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61531637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30765803 + 30765804.

It is an arithmetic number, because the mean of its divisors is an integer number (30765804).

Almost surely, 2^61531607 is an apocalyptic number.

61531607 is a deficient number, since it is larger than the sum of its proper divisors (1).

61531607 is an equidigital number, since it uses as much as digits as its factorization.

61531607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 61531607 is about 7844.2085005436. The cubic root of 61531607 is about 394.7899476039.

The spelling of 61531607 in words is "sixty-one million, five hundred thirty-one thousand, six hundred seven".