1972154879 has 2 divisors, whose sum is σ = 1972154880. Its totient is φ = 1972154878.

The previous prime is 1972154851. The next prime is 1972154897. The reversal of 1972154879 is 9784512791.

Together with next prime (1972154897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1972154879 - 2²⁴ = 1955377663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1972154879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1972154809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986077439 + 986077440.

It is an arithmetic number, because the mean of its divisors is an integer number (986077440).

Almost surely, 2^1972154879 is an apocalyptic number.

1972154879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972154879 is an equidigital number, since it uses as much as digits as its factorization.

1972154879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 53.

The square root of 1972154879 is about 44408.9504379466. The cubic root of 1972154879 is about 1254.0465934491.

The spelling of 1972154879 in words is "one billion, nine hundred seventy-two million, one hundred fifty-four thousand, eight hundred seventy-nine".