1231451151487 has 2 divisors, whose sum is σ = 1231451151488. Its totient is φ = 1231451151486.

The previous prime is 1231451151433. The next prime is 1231451151517. The reversal of 1231451151487 is 7841511541321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231451151487 is a prime.

It is a super-2 number, since 2×1231451151487² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231451151787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615725575743 + 615725575744.

It is an arithmetic number, because the mean of its divisors is an integer number (615725575744).

Almost surely, 2^{1231451151487} is an apocalyptic number.

1231451151487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231451151487 is an equidigital number, since it uses as much as digits as its factorization.

1231451151487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 43.

The spelling of 1231451151487 in words is "one trillion, two hundred thirty-one billion, four hundred fifty-one million, one hundred fifty-one thousand, four hundred eighty-seven".