61751869 has 2 divisors, whose sum is σ = 61751870. Its totient is φ = 61751868.

The previous prime is 61751867. The next prime is 61751873. The reversal of 61751869 is 96815716.

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., 35105625 + 26646244 = 5925^2 + 5162^2 .

It is a cyclic number.

It is not a de Polignac number, because 61751869 - 2¹ = 61751867 is a prime.

It is a super-2 number, since 2×61751869² = 7626586649986322, which contains 22 as substring.

Together with 61751867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61751861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30875934 + 30875935.

It is an arithmetic number, because the mean of its divisors is an integer number (30875935).

Almost surely, 2^61751869 is an apocalyptic number.

It is an amenable number.

61751869 is a deficient number, since it is larger than the sum of its proper divisors (1).

61751869 is an equidigital number, since it uses as much as digits as its factorization.

61751869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 61751869 is about 7858.2357434732. The cubic root of 61751869 is about 395.2604573930.

The spelling of 61751869 in words is "sixty-one million, seven hundred fifty-one thousand, eight hundred sixty-nine".