7681961 has 4 divisors (see below), whose sum is σ = 8779392. Its totient is φ = 6584532.

The previous prime is 7681939. The next prime is 7681969. The reversal of 7681961 is 1691867.

7681961 = T₁₄₇₈ + T₁₄₇₉ + ... + T₁₄₈₄.

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 a de Polignac number, because none of the positive numbers 2^k-7681961 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7681969) 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, 548705 + ... + 548718.

It is an arithmetic number, because the mean of its divisors is an integer number (2194848).

Almost surely, 2^7681961 is an apocalyptic number.

It is an amenable number.

7681961 is a deficient number, since it is larger than the sum of its proper divisors (1097431).

7681961 is a wasteful number, since it uses less digits than its factorization.

7681961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097430.

The product of its digits is 18144, while the sum is 38.

The square root of 7681961 is about 2771.6350769898. The cubic root of 7681961 is about 197.3137570239.

The spelling of 7681961 in words is "seven million, six hundred eighty-one thousand, nine hundred sixty-one".