1542735721031 has 2 divisors, whose sum is σ = 1542735721032. Its totient is φ = 1542735721030.

The previous prime is 1542735720973. The next prime is 1542735721063. The reversal of 1542735721031 is 1301275372451.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1542735721031 - 2¹⁴ = 1542735704647 is a prime.

It is a super-2 number, since 2×1542735721031² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1542735721031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1542735724031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771367860515 + 771367860516.

It is an arithmetic number, because the mean of its divisors is an integer number (771367860516).

Almost surely, 2^{1542735721031} is an apocalyptic number.

1542735721031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542735721031 is an equidigital number, since it uses as much as digits as its factorization.

1542735721031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 1542735721031 in words is "one trillion, five hundred forty-two billion, seven hundred thirty-five million, seven hundred twenty-one thousand, thirty-one".