1861049431 has 2 divisors, whose sum is σ = 1861049432. Its totient is φ = 1861049430.

The previous prime is 1861049429. The next prime is 1861049461. The reversal of 1861049431 is 1349401681.

It is a weak prime.

It is an emirp because it is prime and its reverse (1349401681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1861049431 - 2¹ = 1861049429 is a prime.

It is a super-2 number, since 2×1861049431² = 6927009969250847522, which contains 22 as substring.

Together with 1861049429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861049461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930524715 + 930524716.

It is an arithmetic number, because the mean of its divisors is an integer number (930524716).

Almost surely, 2^1861049431 is an apocalyptic number.

1861049431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861049431 is an equidigital number, since it uses as much as digits as its factorization.

1861049431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 1861049431 is about 43139.8821393847. The cubic root of 1861049431 is about 1230.0401932357.

The spelling of 1861049431 in words is "one billion, eight hundred sixty-one million, forty-nine thousand, four hundred thirty-one".