61809494 has 8 divisors (see below), whose sum is σ = 92778960. Its totient is φ = 30883176.

The previous prime is 61809493. The next prime is 61809563. The reversal of 61809494 is 49490816.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61809491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6929 + ... + 13100.

It is an arithmetic number, because the mean of its divisors is an integer number (11597370).

Almost surely, 2^61809494 is an apocalyptic number.

61809494 is a deficient number, since it is larger than the sum of its proper divisors (30969466).

61809494 is a wasteful number, since it uses less digits than its factorization.

61809494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21574.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 61809494 is about 7861.9014239559. The cubic root of 61809494 is about 395.3833675872.

The spelling of 61809494 in words is "sixty-one million, eight hundred nine thousand, four hundred ninety-four".