1601478877 has 2 divisors, whose sum is σ = 1601478878. Its totient is φ = 1601478876.

The previous prime is 1601478869. The next prime is 1601478883. The reversal of 1601478877 is 7788741061.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1476173241 + 125305636 = 38421^2 + 11194^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601478877 - 2³ = 1601478869 is a prime.

It is a super-2 number, since 2×1601478877² = 5129469186954362258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1601478877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601478377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800739438 + 800739439.

It is an arithmetic number, because the mean of its divisors is an integer number (800739439).

Almost surely, 2^1601478877 is an apocalyptic number.

It is an amenable number.

1601478877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601478877 is an equidigital number, since it uses as much as digits as its factorization.

1601478877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 526848, while the sum is 49.

The square root of 1601478877 is about 40018.4816928379. The cubic root of 1601478877 is about 1169.9673395320.

The spelling of 1601478877 in words is "one billion, six hundred one million, four hundred seventy-eight thousand, eight hundred seventy-seven".