61081995 has 16 divisors (see below), whose sum is σ = 105249312. Its totient is φ = 30071040.

The previous prime is 61081981. The next prime is 61082009. The reversal of 61081995 is 59918016.

It is an interprime number because it is at equal distance from previous prime (61081981) and next prime (61082009).

It is not a de Polignac number, because 61081995 - 2⁵ = 61081963 is a prime.

It is a super-2 number, since 2×61081995² = 7462020226360050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156426 + ... + 156815.

It is an arithmetic number, because the mean of its divisors is an integer number (6578082).

Almost surely, 2^61081995 is an apocalyptic number.

61081995 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61081995 is a deficient number, since it is larger than the sum of its proper divisors (44167317).

61081995 is a wasteful number, since it uses less digits than its factorization.

61081995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313262.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 61081995 is about 7815.4971051111. The cubic root of 61081995 is about 393.8260180767.

The spelling of 61081995 in words is "sixty-one million, eighty-one thousand, nine hundred ninety-five".