1507661 has 4 divisors (see below), whose sum is σ = 1510272. Its totient is φ = 1505052.

The previous prime is 1507657. The next prime is 1507687. The reversal of 1507661 is 1667051.

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 not a de Polignac number, because 1507661 - 2² = 1507657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1507661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1507651) 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, 11 + ... + 1736.

It is an arithmetic number, because the mean of its divisors is an integer number (377568).

2^1507661 is an apocalyptic number.

It is an amenable number.

1507661 is a deficient number, since it is larger than the sum of its proper divisors (2611).

1507661 is an equidigital number, since it uses as much as digits as its factorization.

1507661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 1507661 is about 1227.8684782989. The cubic root of 1507661 is about 114.6659746593.

The spelling of 1507661 in words is "one million, five hundred seven thousand, six hundred sixty-one".