1961277047 has 16 divisors (see below), whose sum is σ = 2054824800. Its totient is φ = 1869557760.

The previous prime is 1961277007. The next prime is 1961277077. The reversal of 1961277047 is 7407721691.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961277047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1961276989 and 1961277007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961277007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1943279 + ... + 1944287.

It is an arithmetic number, because the mean of its divisors is an integer number (128426550).

Almost surely, 2^1961277047 is an apocalyptic number.

1961277047 is a deficient number, since it is larger than the sum of its proper divisors (93547753).

1961277047 is a wasteful number, since it uses less digits than its factorization.

1961277047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826.

The product of its (nonzero) digits is 148176, while the sum is 44.

The square root of 1961277047 is about 44286.3076695269. The cubic root of 1961277047 is about 1251.7366893706.

The spelling of 1961277047 in words is "one billion, nine hundred sixty-one million, two hundred seventy-seven thousand, forty-seven".