61909971 has 8 divisors (see below), whose sum is σ = 87402384. Its totient is φ = 38845440.

The previous prime is 61909963. The next prime is 61909973. The reversal of 61909971 is 17990916.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61909971 - 2³ = 61909963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61909973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 606910 + ... + 607011.

It is an arithmetic number, because the mean of its divisors is an integer number (10925298).

Almost surely, 2^61909971 is an apocalyptic number.

61909971 is a deficient number, since it is larger than the sum of its proper divisors (25492413).

61909971 is a wasteful number, since it uses less digits than its factorization.

61909971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213941.

The product of its (nonzero) digits is 30618, while the sum is 42.

The square root of 61909971 is about 7868.2889499560. The cubic root of 61909971 is about 395.5974955735.

It can be divided in two parts, 6190 and 9971, that added together give a palindrome (16161).

The spelling of 61909971 in words is "sixty-one million, nine hundred nine thousand, nine hundred seventy-one".