1242031457 has 2 divisors, whose sum is σ = 1242031458. Its totient is φ = 1242031456.

The previous prime is 1242031421. The next prime is 1242031481. The reversal of 1242031457 is 7541302421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1232290816 + 9740641 = 35104^2 + 3121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242031457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242031057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621015728 + 621015729.

It is an arithmetic number, because the mean of its divisors is an integer number (621015729).

Almost surely, 2^1242031457 is an apocalyptic number.

It is an amenable number.

1242031457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242031457 is an equidigital number, since it uses as much as digits as its factorization.

1242031457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 1242031457 is about 35242.4666701978. The cubic root of 1242031457 is about 1074.9234362633.

Adding to 1242031457 its reverse (7541302421), we get a palindrome (8783333878).

The spelling of 1242031457 in words is "one billion, two hundred forty-two million, thirty-one thousand, four hundred fifty-seven".