7781061 has 12 divisors (see below), whose sum is σ = 10847648. Its totient is φ = 4960824.

The previous prime is 7781057. The next prime is 7781101. The reversal of 7781061 is 1601877.

It is not a de Polignac number, because 7781061 - 2² = 7781057 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7781161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 865 + ... + 4038.

Almost surely, 2^7781061 is an apocalyptic number.

It is an amenable number.

7781061 is a deficient number, since it is larger than the sum of its proper divisors (3066587).

7781061 is a wasteful number, since it uses less digits than its factorization.

7781061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4952 (or 4929 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 30.

The square root of 7781061 is about 2789.4553231769. The cubic root of 7781061 is about 198.1586067178.

The spelling of 7781061 in words is "seven million, seven hundred eighty-one thousand, sixty-one".