1541720057 has 4 divisors (see below), whose sum is σ = 1563434496. Its totient is φ = 1520005620.

The previous prime is 1541720041. The next prime is 1541720083. The reversal of 1541720057 is 7500271451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7500271451 = 19 ⋅394751129.

It is a cyclic number.

It is not a de Polignac number, because 1541720057 - 2⁴ = 1541720041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1541720027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10857113 + ... + 10857254.

It is an arithmetic number, because the mean of its divisors is an integer number (390858624).

Almost surely, 2^1541720057 is an apocalyptic number.

It is an amenable number.

1541720057 is a deficient number, since it is larger than the sum of its proper divisors (21714439).

1541720057 is an equidigital number, since it uses as much as digits as its factorization.

1541720057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21714438.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 1541720057 is about 39264.7431801101. The cubic root of 1541720057 is about 1155.2301302404.

The spelling of 1541720057 in words is "one billion, five hundred forty-one million, seven hundred twenty thousand, fifty-seven".