61869819 has 32 divisors (see below), whose sum is σ = 93772800. Its totient is φ = 35955360.

The previous prime is 61869811. The next prime is 61869827. The reversal of 61869819 is 91896816.

It is an interprime number because it is at equal distance from previous prime (61869811) and next prime (61869827).

It is not a de Polignac number, because 61869819 - 2³ = 61869811 is a prime.

It is a super-2 number, since 2×61869819² = 7655749006185522, which contains 22 as substring.

61869819 is a strobogrammatic number because it is the same when read upside-down.

It is not an unprimeable number, because it can be changed into a prime (61869811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83352 + ... + 84090.

It is an arithmetic number, because the mean of its divisors is an integer number (2930400).

Almost surely, 2^61869819 is an apocalyptic number.

61869819 is a deficient number, since it is larger than the sum of its proper divisors (31902981).

61869819 is a wasteful number, since it uses less digits than its factorization.

61869819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855.

The product of its digits is 186624, while the sum is 48.

The square root of 61869819 is about 7865.7370284036. The cubic root of 61869819 is about 395.5119548789.

The spelling of 61869819 in words is "sixty-one million, eight hundred sixty-nine thousand, eight hundred nineteen".