61001869 has 2 divisors, whose sum is σ = 61001870. Its totient is φ = 61001868.

The previous prime is 61001867. The next prime is 61001881. The reversal of 61001869 is 96810016.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53846244 + 7155625 = 7338^2 + 2675^2 .

It is a cyclic number.

It is not a de Polignac number, because 61001869 - 2¹ = 61001867 is a prime.

It is a super-2 number, since 2×61001869² = 7442456042986322, which contains 22 as substring.

Together with 61001867, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 61001869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61001861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30500934 + 30500935.

It is an arithmetic number, because the mean of its divisors is an integer number (30500935).

Almost surely, 2^61001869 is an apocalyptic number.

It is an amenable number.

61001869 is a deficient number, since it is larger than the sum of its proper divisors (1).

61001869 is an equidigital number, since it uses as much as digits as its factorization.

61001869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 61001869 is about 7810.3693254545. The cubic root of 61001869 is about 393.6537386589.

The spelling of 61001869 in words is "sixty-one million, one thousand, eight hundred sixty-nine".