1539961 has 2 divisors, whose sum is σ = 1539962. Its totient is φ = 1539960.

The previous prime is 1539943. The next prime is 1539971. The reversal of 1539961 is 1699351.

1539961 is an esthetic number in base 5, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 962361 + 577600 = 981^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 1539961 - 2⁹ = 1539449 is a prime.

1539961 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1539971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769980 + 769981.

It is an arithmetic number, because the mean of its divisors is an integer number (769981).

2^1539961 is an apocalyptic number.

It is an amenable number.

1539961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1539961 is an equidigital number, since it uses as much as digits as its factorization.

1539961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7290, while the sum is 34.

The square root of 1539961 is about 1240.9516509518. The cubic root of 1539961 is about 115.4790601895.

It can be divided in two parts, 1539 and 961, that added together give a square (2500 = 50²).

The spelling of 1539961 in words is "one million, five hundred thirty-nine thousand, nine hundred sixty-one".