7497661 has 4 divisors (see below), whose sum is σ = 7624800. Its totient is φ = 7370524.

The previous prime is 7497649. The next prime is 7497703. The reversal of 7497661 is 1667947.

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-7497661 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

7497661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7497601) 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, 63481 + ... + 63598.

It is an arithmetic number, because the mean of its divisors is an integer number (1906200).

Almost surely, 2^7497661 is an apocalyptic number.

It is an amenable number.

7497661 is a deficient number, since it is larger than the sum of its proper divisors (127139).

7497661 is a wasteful number, since it uses less digits than its factorization.

7497661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127138.

The product of its digits is 63504, while the sum is 40.

The square root of 7497661 is about 2738.1857132050. The cubic root of 7497661 is about 195.7230313307.

The spelling of 7497661 in words is "seven million, four hundred ninety-seven thousand, six hundred sixty-one".