61531335497 has 8 divisors (see below), whose sum is σ = 62844940800. Its totient is φ = 60217914784.

The previous prime is 61531335487. The next prime is 61531335617. The reversal of 61531335497 is 79453313516.

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-61531335497 is a prime.

It is a super-2 number, since 2×61531335497² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is not an unprimeable number, because it can be changed into a prime (61531335487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 786029 + ... + 860757.

It is an arithmetic number, because the mean of its divisors is an integer number (7855617600).

Almost surely, 2^61531335497 is an apocalyptic number.

It is an amenable number.

61531335497 is a deficient number, since it is larger than the sum of its proper divisors (1313605303).

61531335497 is a wasteful number, since it uses less digits than its factorization.

61531335497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92295.

The product of its digits is 1020600, while the sum is 47.

The spelling of 61531335497 in words is "sixty-one billion, five hundred thirty-one million, three hundred thirty-five thousand, four hundred ninety-seven".