61531494 has 8 divisors (see below), whose sum is σ = 123063000. Its totient is φ = 20510496.

The previous prime is 61531471. The next prime is 61531499. The reversal of 61531494 is 49413516.

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

61531494 is an admirable number.

It is a super-2 number, since 2×61531494² = 7572249507744072, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61531499) 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, 5127619 + ... + 5127630.

It is an arithmetic number, because the mean of its divisors is an integer number (15382875).

Almost surely, 2^61531494 is an apocalyptic number.

61531494 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61531494 is a wasteful number, since it uses less digits than its factorization.

61531494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10255254.

The product of its digits is 12960, while the sum is 33.

The square root of 61531494 is about 7844.2012977740. The cubic root of 61531494 is about 394.7897059325.

The spelling of 61531494 in words is "sixty-one million, five hundred thirty-one thousand, four hundred ninety-four".