61331017801 has 3 divisors (see below), whose sum is σ = 61331265453. Its totient is φ = 61330770150.

The previous prime is 61331017789. The next prime is 61331017837. The reversal of 61331017801 is 10871013316.

The square root of 61331017801 is 247651.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 61331017801 - 2¹³ = 61331009609 is a prime.

It is a super-2 number, since 2×61331017801² (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 (61331047801) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 123826 + ... + 371476.

It is an arithmetic number, because the mean of its divisors is an integer number (20443755151).

Almost surely, 2^61331017801 is an apocalyptic number.

61331017801 is the 247651-st square number.

61331017801 is the 123826-th centered octagonal number.

It is an amenable number.

61331017801 is a deficient number, since it is larger than the sum of its proper divisors (247652).

61331017801 is an frugal number, since it uses more digits than its factorization.

61331017801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495302 (or 247651 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The spelling of 61331017801 in words is "sixty-one billion, three hundred thirty-one million, seventeen thousand, eight hundred one".