1509961 has 2 divisors, whose sum is σ = 1509962. Its totient is φ = 1509960.

The previous prime is 1509953. The next prime is 1509967. The reversal of 1509961 is 1699051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 962361 + 547600 = 981^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 1509961 - 2³ = 1509953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1509967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 754980 + 754981.

It is an arithmetic number, because the mean of its divisors is an integer number (754981).

2^1509961 is an apocalyptic number.

It is an amenable number.

1509961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1509961 is an equidigital number, since it uses as much as digits as its factorization.

1509961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 1509961 is about 1228.8047037670. The cubic root of 1509961 is about 114.7242542823.

The spelling of 1509961 in words is "one million, five hundred nine thousand, nine hundred sixty-one".