61812493 has 8 divisors (see below), whose sum is σ = 65784312. Its totient is φ = 57878016.

The previous prime is 61812479. The next prime is 61812511. The reversal of 61812493 is 39421816.

It can be written as a sum of positive squares in 4 ways, for example, as 42994249 + 18818244 = 6557^2 + 4338^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61812493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61812433) 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, 5880 + ... + 12577.

It is an arithmetic number, because the mean of its divisors is an integer number (8223039).

Almost surely, 2^61812493 is an apocalyptic number.

It is an amenable number.

61812493 is a deficient number, since it is larger than the sum of its proper divisors (3971819).

61812493 is a wasteful number, since it uses less digits than its factorization.

61812493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18671.

The product of its digits is 10368, while the sum is 34.

The square root of 61812493 is about 7862.0921515841. The cubic root of 61812493 is about 395.3897621579.

The spelling of 61812493 in words is "sixty-one million, eight hundred twelve thousand, four hundred ninety-three".