61843997 has 2 divisors, whose sum is σ = 61843998. Its totient is φ = 61843996.

The previous prime is 61843973. The next prime is 61844021. The reversal of 61843997 is 79934816.

It is a balanced prime because it is at equal distance from previous prime (61843973) and next prime (61844021).

It can be written as a sum of positive squares in only one way, i.e., 33339076 + 28504921 = 5774^2 + 5339^2 .

It is a cyclic number.

It is not a de Polignac number, because 61843997 - 2¹⁰ = 61842973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61843937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30921998 + 30921999.

It is an arithmetic number, because the mean of its divisors is an integer number (30921999).

Almost surely, 2^61843997 is an apocalyptic number.

It is an amenable number.

61843997 is a deficient number, since it is larger than the sum of its proper divisors (1).

61843997 is an equidigital number, since it uses as much as digits as its factorization.

61843997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 61843997 is about 7864.0954343141. The cubic root of 61843997 is about 395.4569235727.

The spelling of 61843997 in words is "sixty-one million, eight hundred forty-three thousand, nine hundred ninety-seven".