610721401 has 4 divisors (see below), whose sum is σ = 611281252. Its totient is φ = 610161552.

The previous prime is 610721357. The next prime is 610721467. The reversal of 610721401 is 104127016.

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

It can be written as a sum of positive squares in 2 ways, for example, as 307125625 + 303595776 = 17525^2 + 17424^2 .

It is a cyclic number.

It is not a de Polignac number, because 610721401 - 2¹⁹ = 610197113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (610721201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278286 + ... + 280471.

It is an arithmetic number, because the mean of its divisors is an integer number (152820313).

Almost surely, 2^610721401 is an apocalyptic number.

It is an amenable number.

610721401 is a deficient number, since it is larger than the sum of its proper divisors (559851).

610721401 is a wasteful number, since it uses less digits than its factorization.

610721401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559850.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 610721401 is about 24712.7780915056. The cubic root of 610721401 is about 848.4268021996.

Adding to 610721401 its reverse (104127016), we get a palindrome (714848417).

The spelling of 610721401 in words is "six hundred ten million, seven hundred twenty-one thousand, four hundred one".