61471909 has 8 divisors (see below), whose sum is σ = 63756000. Its totient is φ = 59198832.

The previous prime is 61471901. The next prime is 61471931. The reversal of 61471909 is 90917416.

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

It is a cyclic number.

It is not a de Polignac number, because 61471909 - 2³ = 61471901 is a prime.

It is a super-2 number, since 2×61471909² = 7557591192208562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61471901) 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, 9622 + ... + 14680.

It is an arithmetic number, because the mean of its divisors is an integer number (7969500).

Almost surely, 2^61471909 is an apocalyptic number.

It is an amenable number.

61471909 is a deficient number, since it is larger than the sum of its proper divisors (2284091).

61471909 is a wasteful number, since it uses less digits than its factorization.

61471909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5507.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 61471909 is about 7840.4023493696. The cubic root of 61471909 is about 394.6622311478.

The spelling of 61471909 in words is "sixty-one million, four hundred seventy-one thousand, nine hundred nine".