61731001 has 4 divisors (see below), whose sum is σ = 62474832. Its totient is φ = 60987172.

The previous prime is 61730993. The next prime is 61731037. The reversal of 61731001 is 10013716.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61731001 - 2³ = 61730993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61731001.

It is not an unprimeable number, because it can be changed into a prime (61731041) 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, 371791 + ... + 371956.

It is an arithmetic number, because the mean of its divisors is an integer number (15618708).

Almost surely, 2^61731001 is an apocalyptic number.

It is an amenable number.

61731001 is a deficient number, since it is larger than the sum of its proper divisors (743831).

61731001 is an equidigital number, since it uses as much as digits as its factorization.

61731001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743830.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 61731001 is about 7856.9078523297. The cubic root of 61731001 is about 395.2159285139.

Adding to 61731001 its reverse (10013716), we get a palindrome (71744717).

The spelling of 61731001 in words is "sixty-one million, seven hundred thirty-one thousand, one".