611260721 has 16 divisors (see below), whose sum is σ = 657720000. Its totient is φ = 567993664.

The previous prime is 611260717. The next prime is 611260739. The reversal of 611260721 is 127062116.

It is not a de Polignac number, because 611260721 - 2² = 611260717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611260751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407030 + ... + 408528.

It is an arithmetic number, because the mean of its divisors is an integer number (41107500).

Almost surely, 2^611260721 is an apocalyptic number.

It is an amenable number.

611260721 is a deficient number, since it is larger than the sum of its proper divisors (46459279).

611260721 is an equidigital number, since it uses as much as digits as its factorization.

611260721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633 (or 1599 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 611260721 is about 24723.6874474662. The cubic root of 611260721 is about 848.6764735533.

The spelling of 611260721 in words is "six hundred eleven million, two hundred sixty thousand, seven hundred twenty-one".