61425842531 has 4 divisors (see below), whose sum is σ = 61538138952. Its totient is φ = 61313546112.

The previous prime is 61425842503. The next prime is 61425842549. The reversal of 61425842531 is 13524852416.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61425842531 is a prime.

It is a super-2 number, since 2×61425842531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61425842431) 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, 56147390 + ... + 56148483.

It is an arithmetic number, because the mean of its divisors is an integer number (15384534738).

Almost surely, 2^61425842531 is an apocalyptic number.

61425842531 is a deficient number, since it is larger than the sum of its proper divisors (112296421).

61425842531 is a wasteful number, since it uses less digits than its factorization.

61425842531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112296420.

The product of its digits is 230400, while the sum is 41.

The spelling of 61425842531 in words is "sixty-one billion, four hundred twenty-five million, eight hundred forty-two thousand, five hundred thirty-one".