1940142251 has 2 divisors, whose sum is σ = 1940142252. Its totient is φ = 1940142250.

The previous prime is 1940142233. The next prime is 1940142293. The reversal of 1940142251 is 1522410491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1940142251 - 2²⁶ = 1873033387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1940142151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970071125 + 970071126.

It is an arithmetic number, because the mean of its divisors is an integer number (970071126).

Almost surely, 2^1940142251 is an apocalyptic number.

1940142251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1940142251 is an equidigital number, since it uses as much as digits as its factorization.

1940142251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1940142251 is about 44047.0458827831. The cubic root of 1940142251 is about 1247.2241873340.

The spelling of 1940142251 in words is "one billion, nine hundred forty million, one hundred forty-two thousand, two hundred fifty-one".