1972140251 has 2 divisors, whose sum is σ = 1972140252. Its totient is φ = 1972140250.

The previous prime is 1972140239. The next prime is 1972140253. The reversal of 1972140251 is 1520412791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1972140251 is a prime.

It is a super-2 number, since 2×1972140251² = 7778674339228686002, which contains 22 as substring.

Together with 1972140253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1972140253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986070125 + 986070126.

It is an arithmetic number, because the mean of its divisors is an integer number (986070126).

Almost surely, 2^1972140251 is an apocalyptic number.

1972140251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972140251 is an equidigital number, since it uses as much as digits as its factorization.

1972140251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1972140251 is about 44408.7857411121. The cubic root of 1972140251 is about 1254.0434929085.

The spelling of 1972140251 in words is "one billion, nine hundred seventy-two million, one hundred forty thousand, two hundred fifty-one".