1020231257 has 2 divisors, whose sum is σ = 1020231258. Its totient is φ = 1020231256.

The previous prime is 1020231221. The next prime is 1020231271. The reversal of 1020231257 is 7521320201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 977250121 + 42981136 = 31261^2 + 6556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020231257 - 2¹² = 1020227161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020281257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510115628 + 510115629.

It is an arithmetic number, because the mean of its divisors is an integer number (510115629).

Almost surely, 2^1020231257 is an apocalyptic number.

It is an amenable number.

1020231257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020231257 is an equidigital number, since it uses as much as digits as its factorization.

1020231257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 1020231257 is about 31941.0591089275. The cubic root of 1020231257 is about 1006.6987785004.

Adding to 1020231257 its reverse (7521320201), we get a palindrome (8541551458).

The spelling of 1020231257 in words is "one billion, twenty million, two hundred thirty-one thousand, two hundred fifty-seven".