61931493 has 64 divisors (see below), whose sum is σ = 106686720. Its totient is φ = 35168256.

The previous prime is 61931491. The next prime is 61931537. The reversal of 61931493 is 39413916.

61931493 is a `hidden beast` number, since 619 + 31 + 4 + 9 + 3 = 666.

It is not a de Polignac number, because 61931493 - 2¹ = 61931491 is a prime.

Its product of digits (17496) is a multiple of the sum of its prime factors (243).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61931491) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 578746 + ... + 578852.

It is an arithmetic number, because the mean of its divisors is an integer number (1666980).

Almost surely, 2^61931493 is an apocalyptic number.

It is an amenable number.

61931493 is a deficient number, since it is larger than the sum of its proper divisors (44755227).

61931493 is a wasteful number, since it uses less digits than its factorization.

61931493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 237 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 61931493 is about 7869.6564728074. The cubic root of 61931493 is about 395.6433312860.

The spelling of 61931493 in words is "sixty-one million, nine hundred thirty-one thousand, four hundred ninety-three".