61494709 has 4 divisors (see below), whose sum is σ = 64168416. Its totient is φ = 58821004.

The previous prime is 61494701. The next prime is 61494721. The reversal of 61494709 is 90749416.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61494709 - 2³ = 61494701 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61494701) 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, 1336819 + ... + 1336864.

It is an arithmetic number, because the mean of its divisors is an integer number (16042104).

Almost surely, 2^61494709 is an apocalyptic number.

It is an amenable number.

61494709 is a deficient number, since it is larger than the sum of its proper divisors (2673707).

61494709 is a wasteful number, since it uses less digits than its factorization.

61494709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2673706.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 61494709 is about 7841.8562215843. The cubic root of 61494709 is about 394.7110186712.

The spelling of 61494709 in words is "sixty-one million, four hundred ninety-four thousand, seven hundred nine".